Intermittent Fasting to Improve Insulin Sensitivity

You’ve been eating six small meals daily for years because conventional wisdom says frequent eating boosts metabolism and prevents blood sugar crashes. Yet you’re gaining weight, feeling tired between meals, and your fasting glucose has crept to 105 mg/dL despite careful portion control. Your doctor suggests eating even more frequently to keep blood sugar stable. This advice seems logical but produces the opposite of intended results because constant eating maintains chronically elevated insulin that prevents fat burning, worsens insulin resistance through continuous cellular insulin exposure, and never allows the metabolic benefits that occur during extended fasting periods.

Intermittent fasting reverses this pattern by consolidating eating into specific time windows, creating extended fasting periods where insulin drops to baseline and metabolic repair processes activate. Understanding what intermittent fasting actually does to insulin and glucose metabolism, which fasting protocols work best for insulin resistance reversal, how to implement fasting safely and effectively, what mistakes undermine fasting benefits, and how fasting combines with carbohydrate restriction for maximum metabolic improvement transforms fasting from a weight loss fad into a powerful tool for restoring insulin sensitivity and reversing the progression toward diabetes that constant eating perpetuates regardless of total calories consumed.

How Fasting Improves Insulin Sensitivity: The Mechanisms

Intermittent fasting improves insulin sensitivity through multiple interconnected mechanisms that work synergistically to restore metabolic function.

Mechanism 1: Insulin baseline recovery

Every time you eat, insulin rises from its baseline level. With three meals daily, insulin rises three times but returns to baseline between meals. With six meals plus snacks, insulin rises eight to ten times daily and never fully returns to baseline, maintaining chronic low-grade hyperinsulinemia.

This constant insulin exposure desensitizes cells to insulin’s signals. Insulin receptors downregulate, becoming less responsive. Intracellular signaling pathways become impaired. The result is insulin resistance at the cellular level driven by excessive insulin exposure.

Fasting creates extended periods where insulin drops to true baseline levels, typically 5 μU/mL or lower. During these periods, cells recover from insulin exposure. Insulin receptors upregulate. Signaling pathways repair. Sensitivity improves through simple withdrawal of the overstimulating signal.

A 16-hour daily fast means insulin stays at baseline for 12 to 14 hours after accounting for the tail of insulin elevation from the last meal. This extended recovery period allows substantial cellular restoration that’s impossible with frequent eating.

Mechanism 2: Glycogen depletion and metabolic switching

The liver stores about 100 to 120 grams of glycogen that serves as readily available glucose. During fasting, the body first uses circulating glucose, then depletes liver glycogen over 12 to 16 hours depending on activity level and metabolic rate.

Once glycogen is depleted, the body must switch to alternative fuel sources, primarily fat. This metabolic switching upregulates enzymes and pathways for fat oxidation. Hormone-sensitive lipase activates, releasing fatty acids from adipose tissue. Mitochondria increase fat-burning capacity. Ketone production may begin if fasting extends beyond 16 to 18 hours.

This switching is metabolically healthy and was normal for humans throughout evolution when food wasn’t constantly available. Modern constant eating prevents this switching, keeping people perpetually in glucose-burning mode where fat stores are never accessed.

Regular fasting trains the body to switch efficiently between fuel sources, improving metabolic flexibility that’s lost with insulin resistance. Better metabolic flexibility means improved insulin sensitivity and easier access to stored fat.

Mechanism 3: Autophagy activation

Autophagy is the cellular process of breaking down and recycling damaged proteins, organelles, and other cellular components. It’s essential for cellular health and renewal. Insulin suppresses autophagy, while fasting activates it.

During fasting, particularly after 16 to 24 hours, autophagy increases significantly. Cells break down dysfunctional insulin receptors, damaged mitochondria, and accumulated protein aggregates. This cellular housekeeping improves overall cellular function including insulin signaling.

The damaged insulin receptors and impaired signaling molecules that contribute to insulin resistance are cleared away and replaced with functional components. This represents true cellular repair rather than just symptom management.

Mechanism 4: Reduced total insulin exposure

Simply by limiting eating to a shorter window, intermittent fasting reduces the number of times insulin must rise daily. Someone eating six times daily has six insulin spikes. Someone eating twice daily in an 8-hour window has two spikes.

Fewer insulin spikes mean less total insulin exposure over 24 hours even if the amount of food consumed is identical. This reduced insulin burden improves insulin sensitivity over time through decreased chronic stimulation.

Studies measuring 24-hour insulin profiles show that people practicing time-restricted eating have 20 to 30 percent lower total daily insulin exposure compared to those eating the same calories spread across more frequent meals.

Mechanism 5: Hormetic stress response

Fasting represents a mild stress that triggers beneficial adaptive responses. The body interprets brief food scarcity as a signal to optimize metabolic efficiency and cellular resilience.

Stress response proteins like heat shock proteins increase. Antioxidant defenses upregulate. Mitochondrial biogenesis increases, creating new, more efficient energy-producing organelles. Cellular repair mechanisms activate.

These adaptations don’t just help during fasting. They persist during fed periods, creating overall improved metabolic health. The body becomes better at handling glucose, producing appropriate insulin responses, and maintaining cellular function.

Time-Restricted Eating: The Most Sustainable Approach

Time-restricted eating (TRE) limits daily food intake to a specific window, typically 6 to 10 hours, creating a daily fast of 14 to 18 hours. This is the most practical and sustainable form of intermittent fasting for most people.

The 16:8 protocol (16 hours fasting, 8 hour eating window):

This is the most popular and well-studied TRE approach. You fast for 16 hours daily and eat all meals within an 8-hour window. For example, eating between noon and 8 PM means fasting from 8 PM to noon the next day.

The 16-hour fast is long enough to deplete liver glycogen, drop insulin to baseline, and activate fat burning and early autophagy. It’s short enough that most people adapt easily within 1 to 2 weeks without significant hunger or difficulty.

Example schedule:
– 8 PM: Finish dinner
– 8 PM to midnight: Evening fasting begins
– Midnight to 8 AM: Overnight fast continues (sleeping)
– 8 AM to noon: Morning fasted period (most people find this easier than skipping dinner)
– Noon: First meal (break-fast)
– 4 PM: Optional second meal or snack
– 8 PM: Final meal
– Repeat

Most people skip breakfast and eat lunch as their first meal. This works well because morning fasting feels natural after overnight sleep, and you’re busy with work or activities that distract from hunger. By noon, you’ve fasted 16 hours and can eat a satisfying meal.

The 18:6 protocol (18 hours fasting, 6 hour eating window):

A more aggressive approach that extends the fast to 18 hours, leaving only 6 hours for eating. This typically means two meals with no snacks.

Example: Eating between 2 PM and 8 PM. First meal at 2 PM, second meal at 7 PM. Fasting from 8 PM to 2 PM the next day.

The 18-hour fast provides deeper metabolic benefits than 16 hours, with more complete glycogen depletion and longer time in fat-burning mode. However, it’s more challenging to sustain and may not be necessary for most people. Start with 16:8 and progress to 18:6 if desired after adapting.

The 20:4 protocol (20 hours fasting, 4 hour window):

Also called the “Warrior Diet,” this involves one large meal plus potentially a small second meal within a 4-hour window. For example, eating between 4 PM and 8 PM only.

The 20-hour fast maximizes metabolic benefits but is difficult to sustain long-term for most people. It’s challenging to consume adequate nutrition in such a short window. This approach works better as an occasional practice (1 to 2 days weekly) rather than daily protocol.

Choosing your eating window:

The window you choose should fit your lifestyle, social situations, and personal preferences. Common options:

Noon to 8 PM: Skip breakfast, eat lunch and dinner. Works well for people who aren’t hungry in the morning and prefer social dinners.

1 PM to 7 PM: Slightly later start, earlier finish. Good for people who prefer eating less close to bedtime.

8 AM to 4 PM: Early eating window, skip dinner. Works for people who prefer breakfast and early eating but can adapt to skipping dinner. This has theoretical benefits for circadian rhythm alignment but is socially challenging.

Consistency matters more than the specific window. Choose something sustainable that you can maintain long-term rather than the most aggressive option you can tolerate briefly.

What you can consume during fasting:

Water: Unlimited. Staying hydrated is essential during fasting. Many people find they’re often thirsty rather than hungry.

Black coffee: Allowed. Coffee has minimal calories and may enhance fat burning through caffeine. Avoid adding cream, milk, or sweeteners which break the fast by triggering insulin.

Tea (unsweetened): All teas are fine. Green tea may provide additional benefits through catechins that support fat burning.

Sparkling water: Fine as long as it’s unsweetened. Flavored sparkling water without sweeteners is acceptable.

Not allowed (breaks the fast): Anything with calories, including cream in coffee, bone broth, bulletproof coffee with butter or MCT oil, diet sodas with artificial sweeteners (debated but safest to avoid), and all food obviously.

Alternate Day and Extended Fasting Protocols

Beyond daily time restriction, longer fasting periods create additional metabolic benefits but require more careful implementation and aren’t necessary for most people.

Alternate Day Fasting (ADF):

ADF involves alternating between fasting days (zero or minimal calories) and eating days (normal intake). Several variations exist:

Complete ADF: Alternate between days with zero calories (true fasting) and days eating normally. Monday: fast, Tuesday: eat normally, Wednesday: fast, Thursday: eat normally, etc.

This is challenging and not necessary for insulin sensitivity improvement. It’s difficult to sustain and may cause excessive hunger and poor adherence.

Modified ADF (5:2 Diet): Eat normally five days per week, restrict to 500-600 calories on two non-consecutive days. For example, restrict calories Monday and Thursday, eat normally other days.

This is more sustainable than complete ADF and produces benefits similar to daily time restriction. However, daily 16:8 fasting is generally easier to implement consistently.

24-hour fasting once or twice weekly:

Fast from dinner one day to dinner the next day (or breakfast to breakfast). For example, eat dinner at 7 PM Monday, fast all day Tuesday, break fast at 7 PM Tuesday.

This creates one or two 24-hour fasting periods weekly while eating normally other days. Benefits include deeper autophagy activation than daily 16-hour fasts and flexibility to eat daily just in shortened windows.

Many people find this easier than daily fasting schedules because they can eat breakfast and lunch most days, only extending the overnight fast once or twice weekly.

Extended fasting (48-72 hours or longer):

Fasts lasting multiple days create profound metabolic changes including deep ketosis, maximum autophagy, significant fat loss, and potential cellular regeneration. However, these require medical supervision for most people and aren’t necessary for insulin sensitivity improvement.

Extended fasting risks include electrolyte imbalances, excessive muscle loss if not done properly, refeeding syndrome when breaking the fast, and potential negative effects on metabolism if done too frequently.

For insulin resistance reversal, extended fasting beyond 24 hours is unnecessary. The benefits of daily 16-18 hour fasts are substantial and sustainable without the risks of prolonged fasting.

Which protocol for insulin resistance?

For most people with insulin resistance, daily time-restricted eating with 16:8 or 18:6 protocol provides optimal balance of benefits and sustainability. Start with 16:8, potentially progress to 18:6 after adapting.

Adding occasional 24-hour fasts once weekly can enhance benefits for those who tolerate daily fasting well and want additional metabolic stimulus.

Alternate day fasting and extended fasting are unnecessary for insulin sensitivity improvement and introduce complications that outweigh modest additional benefits for this specific goal.

Combining Fasting With Carbohydrate Restriction

Intermittent fasting and carbohydrate restriction work synergistically to improve insulin sensitivity. Combining them produces better results than either alone.

Why the combination matters:

Fasting creates periods of low insulin. Carbohydrate restriction keeps insulin low during eating periods. Together, they minimize total daily insulin exposure far more than either intervention alone.

Someone doing 16:8 fasting but eating high-carb meals during the eating window still experiences significant insulin spikes during those meals. While fasting periods provide benefit, the high-carb meals partially negate improvements.

Someone restricting carbs but eating six times daily keeps insulin moderately elevated throughout waking hours despite lower spikes per meal. The constant insulin exposure impairs cellular recovery.

The combination of 16:8 fasting with low-carb eating (50-100g daily) creates both extended fasting periods with baseline insulin and eating periods with modest insulin elevation. This optimal pattern maximizes insulin sensitivity improvement.

What to eat during eating windows:

Protein foundation: 30-40 grams per meal from meat, fish, eggs, or poultry. Protein provides satiety and preserves muscle during fasting periods.

Healthy fats: 20-35 grams per meal from olive oil, avocado, nuts, butter, or fatty cuts of meat. Fat creates lasting satiety and provides energy without spiking insulin.

Non-starchy vegetables: 2-3 cups per meal. Vegetables provide fiber, nutrients, and volume with minimal insulin impact.

Minimal carbohydrates: Keep total carbs to 15-25 grams per meal, all from vegetables, small portions of berries, or minimal amounts of nuts. Avoid grains, starches, sugars, and most fruit.

Example eating window (noon to 8 PM, 16:8 protocol):

Noon: Break fast with 3 eggs, spinach, mushrooms, cheese, avocado (30g protein, 8g carbs, 42g fat)

4 PM (optional): Small protein-based snack if hungry, like 2 oz cheese or handful of nuts

7 PM: Dinner with 7 oz salmon, 2 cups roasted broccoli and cauliflower in olive oil (45g protein, 15g carbs, 38g fat)

Total daily: 75g protein, 23g carbs, 80g fat = approximately 1,050 calories in two main meals. This provides adequate nutrition while maximizing insulin sensitivity benefits.

Breaking the fast properly:

The first meal after fasting significantly impacts metabolic benefits. Breaking a fast with high-carb foods creates an exaggerated insulin spike because cells are primed for nutrient uptake after fasting.

Bad fast-breaking foods: Orange juice, smoothies with fruit, oatmeal, toast, pastries, cereal. These create massive glucose and insulin spikes that negate much of the fasting benefit.

Good fast-breaking foods: Eggs, avocado, meat, fish, cheese, non-starchy vegetables. These provide nutrition without spiking insulin dramatically.

The principle is that you’ve just created a metabolic state of excellent insulin sensitivity through fasting. Don’t immediately destroy it by flooding your system with carbohydrates that require massive insulin to manage.

Common Fasting Mistakes That Undermine Insulin Benefits

Several common errors prevent people from achieving the full insulin sensitivity benefits that intermittent fasting can provide.

Mistake 1: Breaking fasts with high-carb foods

This is the most common mistake. People fast diligently for 16 to 18 hours, then break the fast with orange juice and toast, oatmeal with fruit, or a smoothie loaded with bananas and dates.

After fasting, cells are highly insulin-sensitive and primed for nutrient uptake. A high-carb meal creates an exaggerated insulin spike because the body overreacts to incoming glucose after the fasting period. This spike can be even larger than the same meal eaten during a non-fasted state.

This pattern wastes the insulin-sensitizing benefits of the fast by immediately flooding the system with glucose requiring massive insulin. It’s like cleaning your kitchen meticulously then immediately making a huge mess.

Solution: Break fasts with protein and fat-based meals containing minimal carbohydrates. Eggs, meat, fish, cheese, avocado, and non-starchy vegetables. Save any higher-carb foods (if including them at all) for later in the eating window after insulin has been re-established at moderate levels.

Mistake 2: Consuming hidden calories during fasting

Many people unknowingly break their fasts with seemingly innocuous additions:

• Cream or milk in coffee (50-100 calories per cup if generous)
– “Bulletproof coffee” with butter and MCT oil (200-400 calories)
– Bone broth (40-80 calories per cup)
– Diet sodas or artificially sweetened drinks (debated, but may trigger insulin in some people)
– Gum or mints with sugar alcohols

Any caloric intake triggers digestive processes and insulin secretion, breaking the fast. Even small amounts prevent the body from fully entering the fasted metabolic state.

Solution: During fasting periods, consume only water, black coffee, or unsweetened tea. No additives, no calories. If you need coffee with cream to tolerate fasting, you’re better off shortening your fast to match when you’d naturally drink black coffee.

Mistake 3: Overeating during eating windows

Some people use fasting as license to binge during eating periods, consuming excessive calories that prevent weight loss despite reduced eating windows.

While fasting improves insulin sensitivity even without calorie restriction, weight loss requires some caloric deficit. Eating 3,000 calories in an 8-hour window won’t produce weight loss even if those are fasted hours before and after.

Additionally, overeating stretches the stomach and may impair satiety signaling over time, making fasting harder to sustain.

Solution: Eat until satisfied but not stuffed during meals. With adequate protein and fat while restricting carbs, hunger naturally regulates intake appropriately without conscious calorie counting. Trust satiety signals rather than eating everything in sight because “the window is closing.”

Mistake 4: Insufficient protein during eating windows

Inadequate protein intake during compressed eating windows can lead to muscle loss, especially when combining fasting with caloric deficit and insulin resistance (which impairs muscle protein synthesis).

Muscle loss reduces metabolic rate, worsens insulin sensitivity over time, and undermines the health improvements fasting should provide. Preserving muscle is essential.

Solution: Prioritize protein at each meal during eating windows. Aim for 30-40 grams per meal, 80-120 grams daily depending on body size and activity level. Make protein the foundation of every meal, not an afterthought.

Mistake 5: Inconsistent fasting schedules

Fasting Monday, Wednesday, Friday but not Tuesday, Thursday, Saturday, Sunday prevents metabolic adaptation. The body never adjusts to the fasting pattern, making each fast as difficult as the first.

Inconsistency also reduces total fasting time weekly, diminishing cumulative benefits.

Solution: Choose a schedule you can maintain daily (or at least 5-6 days weekly). Consistency allows adaptation where fasting becomes easier and benefits accumulate. Weekend exceptions occasionally are fine, but daily adherence produces best results.

Mistake 6: Neglecting sleep and stress

Poor sleep and chronic stress elevate cortisol, which raises blood glucose and impairs insulin sensitivity. These factors can negate fasting benefits entirely.

Someone fasting 16 hours daily but sleeping 5 hours and chronically stressed may see minimal insulin improvement because cortisol-driven glucose elevation and insulin resistance override fasting benefits.

Solution: Prioritize 7-9 hours of quality sleep nightly. Manage stress through whatever techniques work for you (meditation, exercise, time in nature, therapy, boundary-setting). Fasting works best as part of comprehensive lifestyle optimization, not as isolated intervention.

Mistake 7: Fasting without addressing underlying carbohydrate intake

Some people think fasting alone will reverse insulin resistance while continuing to eat 200-300 grams of carbohydrates daily during eating windows. Fasting helps, but it can’t overcome the insulin-spiking effects of continuous high-carb intake.

Solution: Combine fasting with carbohydrate restriction for synergistic effects. Neither intervention alone is as powerful as both together.

Who Should Avoid or Modify Fasting

While intermittent fasting is safe and beneficial for most people, certain groups should avoid it or implement it cautiously under medical supervision.

People who should NOT fast:

• Children and teenagers: Growing bodies need consistent nutrition
– Pregnant or breastfeeding women: Increased nutritional needs and potential risks to baby
– History of eating disorders: Fasting may trigger disordered eating patterns
– Underweight individuals (BMI <18.5): Need to gain weight, not lose it
– Type 1 diabetes: Risk of dangerous hypoglycemia or ketoacidosis without careful medical management

People who should consult doctors before fasting:

• Type 2 diabetes on medications (especially insulin or sulfonylureas): Hypoglycemia risk requires medication adjustment
– Taking multiple medications: Some require food intake, timing considerations
– History of low blood pressure or cardiovascular issues: Fasting may affect blood pressure
– Chronic kidney disease: Metabolic changes during fasting may affect kidney function
– Gout: Fasting can temporarily increase uric acid levels
– Advanced age with frailty: May be more vulnerable to adverse effects

Women may need modifications:

Some women experience menstrual irregularities, fertility issues, or hormonal disruption from aggressive fasting. This appears related to very low calorie intake combined with fasting rather than fasting alone.

Women may do better with slightly shorter fasts (14-16 hours instead of 18-20 hours) and ensuring adequate nutrition during eating windows. If menstrual cycles become irregular or other hormonal symptoms develop, reduce fasting duration or frequency.

Fasting during menstruation is personal preference. Some women find it more difficult due to increased hunger, others notice no difference.

When to stop or modify fasting:

Discontinue fasting if you experience:
– Persistent dizziness or lightheadedness
– Extreme fatigue that doesn’t resolve after adaptation period
– Menstrual irregularities in women
– Worsening of underlying medical conditions
– Obsessive thoughts about food or development of disordered eating patterns
– Significant muscle loss or weakness

These signs suggest fasting may not be appropriate for you currently, or that your protocol needs modification (shorter fasts, more calories during eating windows, medical supervision).

Expected Results and Timeline

Understanding realistic timelines for insulin sensitivity improvement through fasting helps maintain motivation and appropriate expectations.

Week 1-2: Adaptation period

The first two weeks are challenging as your body adapts to fasting. Expect hunger during fasting periods, especially the first few days. Energy may fluctuate. Some people experience headaches or irritability.

These symptoms typically peak days 3-5 then improve substantially. By week 2, most people find fasting much easier than week 1.

Measurable changes: Minimal insulin sensitivity improvement yet, but some people notice reduced bloating and 3-5 lbs weight loss from water and glycogen depletion.

Week 3-4: Beginning improvements

Fasting becomes noticeably easier. Hunger during fasting periods is manageable. Energy stabilizes and often improves compared to pre-fasting baseline. Mental clarity may improve.

Measurable changes: Fasting glucose may drop 5-10 mg/dL. Weight loss becomes steady at 1-2 lbs weekly if in caloric deficit. Waist circumference may decrease 0.5-1 inch.

Month 2-3: Substantial changes

Fasting feels natural and sustainable. Most people no longer experience significant hunger during fasting periods. Energy is stable and often better than before starting fasting. Sleep quality may improve. Mental clarity and focus often enhance.

Measurable changes: Fasting glucose drops 10-20 mg/dL from baseline. If combining with carb restriction, insulin may drop 30-50%. HbA1c begins improving if starting from elevated levels. Weight loss totals 8-15 lbs if in deficit. Waist circumference decreases 2-3 inches.

Month 4-6: Optimized metabolic function

Fasting is effortless and preferred over constant eating. Appetite is well-regulated with natural hunger before meals but no desperate cravings. Energy is consistently good throughout the day. Physical and mental performance often peak.

Measurable changes: Fasting glucose normalized or significantly improved. Insulin sensitivity substantially better, often achieving normal HOMA-IR if starting from insulin resistant state. HbA1c improved 0.3-0.7% if elevated initially. Body composition dramatically improved with fat loss and muscle preservation. Cardiovascular markers (triglycerides, HDL, blood pressure) significantly improved.

Long-term (6+ months): Sustained benefits

Continued practice of intermittent fasting maintains insulin sensitivity improvements. Many people continue indefinitely because it feels better than constant eating, requires less meal planning, and supports weight maintenance effortlessly.

The lifestyle becomes normal rather than feeling like a special diet. Weight stabilizes at healthier levels. Metabolic markers remain improved. Risk of diabetes, cardiovascular disease, and other insulin resistance complications is substantially reduced.

Moving Forward: Fasting as Part of Comprehensive Insulin Strategy

Intermittent fasting improves insulin sensitivity through multiple mechanisms including extended periods of baseline insulin allowing cellular recovery, depletion of glycogen stores activating fat burning, autophagy clearing damaged insulin receptors, reduced total daily insulin exposure, and beneficial stress responses strengthening cellular function.

Time-restricted eating with 16:8 protocol (16 hours fasting, 8 hour eating window) provides optimal balance of benefits and sustainability for most people. Start with 14:10 if needed, progress to 16:8 after adapting. More aggressive protocols like 18:6 or 20:4 offer modest additional benefits but are harder to sustain long-term.

Fasting works best combined with carbohydrate restriction, not as replacement for it. The combination of extended fasting periods plus low-carb eating during feeding windows creates minimal total daily insulin exposure that reverses insulin resistance more effectively than either intervention alone.

Common mistakes that undermine fasting benefits include breaking fasts with high-carb foods that spike insulin immediately after the beneficial fasting period, consuming hidden calories during fasting windows, overeating during eating periods, insufficient protein intake leading to muscle loss, inconsistent fasting schedules preventing adaptation, and neglecting sleep and stress management that override fasting benefits.

Implementation should be gradual: start with 12-14 hour fasts for 1-2 weeks, progress to 16:8 for most people, optimize meal composition during eating windows to low-carb high-protein pattern, and assess results at 3 months before deciding whether to extend fasting duration or maintain current protocol.

Expected timeline shows adaptation challenges in weeks 1-2, beginning improvements in weeks 3-4, substantial metabolic changes by months 2-3, and optimized function by months 4-6 with sustained benefits continuing indefinitely with consistent practice.

Intermittent fasting is not a magic solution that allows poor food choices during eating windows. It’s a powerful tool that amplifies the insulin sensitivity benefits of carbohydrate restriction while adding independent benefits from extended fasting periods. Combined together as part of comprehensive metabolic optimization including sleep, stress management, and resistance training, intermittent fasting helps reverse insulin resistance and restore metabolic health that years or decades of constant eating damaged.

– SolidWeightLoss