Intermittent fasting

Intermittent fasting covers time-restricted eating strategies that can help manage body fat, appetite, and metabolic health while fitting into busy schedules. Learn how fasting may impact energy, training performance, and hormones like testosterone, plus practical ways to do it without sacrificing muscle or recovery.

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The essentials for intermittent fasting — then explore the latest posts below.

Can you chew gum while fasting? What it means for ketosis and autophagy

Can you chew gum while fasting? What it means for ketosis and autophagy

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Jan 08, 2026 · 9 min read

Sugar-free gum is usually compatible with a ketosis-focused fast because one piece is typically a negligible caloric input (often kept under ~30 calories total during the fasting window), but any calorie- or sugar-containing gum can blunt a stricter fast aimed at autophagy, where the safest approach is staying truly calorie-free. The key is how many ...

How the Terry Crews workout routine defies biological aging

How the Terry Crews workout routine defies biological aging

Dr. Bruno Rodriguez, DPT, CSCS avatar
Dr. Bruno Rodriguez, DPT, CSCS: Strength, Recovery, and Physical Therapy Expert
Dec 27, 2025 · 10 min read

By training with high-volume, high-intensity resistance work for 1–2 hours, five days per week (plus ~4 miles of daily running), Terry Crews creates a sustained anabolic and mitochondrial stimulus that can counter the typical male aging curve of ~3%–5% muscle loss per decade and ~1% yearly testosterone decline after 30. Here’s how his consistency, fasting ...

Can i drink coffee while fasting? The metabolic rules you need to know

Can i drink coffee while fasting? The metabolic rules you need to know

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Nov 30, 2025 · 9 min read

Black coffee generally keeps a metabolic fast intact because it has about 2–5 calories per cup and does not trigger a significant insulin response, so fat burning can continue. The nuance is caffeine’s effect on cortisol and your goal (weight loss vs. strict “autophagy” rules), which can change what “allowed” really means. “From a hormonal ...

Does diet coke break a fast? What the science actually says

Does diet coke break a fast? What the science actually says

Dr. Susan Carter, MD avatar
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Nov 29, 2025 · 14 min read

Diet Coke typically does not break a strict, calorie‑based fast because it contains about 0–5 calories per serving. But its non‑nutritive sweeteners can still activate sweet‑taste receptors and the gut–brain axis, potentially nudging insulin, gut hormones, and hunger—and quietly dulling some fasting benefits in certain people. “From a pure calorie standpoint, diet soda does not ...

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