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Intermittent Fasting Guides

Start here for schedules, safety, and answers — dietitian-reviewed.

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Does Bulletproof Coffee Break a Fast?
9 min read

Does Bulletproof Coffee Break a Fast?

Yes. Bulletproof coffee is coffee blended with butter and MCT oil, which adds roughly 200 to 450 calories per cup, so it ends a clean, calorie-free fa...

Why I Stopped Intermittent Fasting: Signs It May Be Time to Pause
12 min read

Why I Stopped Intermittent Fasting: Signs It May Be Time to Pause

Stopping intermittent fasting does not mean you failed. Sometimes it means the schedule has started costing more than it gives back. If fasting is lea...

Who Is Suitable for Intermittent Fasting? A Safer Way to Decide
10 min read

Who Is Suitable for Intermittent Fasting? A Safer Way to Decide

Intermittent fasting may suit some adults who want a simpler structure for eating times, weight management, or consistency. It is usually a better fit...

Can Intermittent Fasting Slow Down Aging?
9 min read

Can Intermittent Fasting Slow Down Aging?

Not in the way most headlines suggest — at least not proven. The most striking anti-aging results for fasting come from animals and from cell biology,...

Intermittent Fasting Side Effects: What Is Common, What Is Not, and When to Stop
4 min read

Intermittent Fasting Side Effects: What Is Common, What Is Not, and When to Stop

Intermittent fasting can cause side effects such as tiredness, dizziness, headaches, mood changes, constipation, and menstrual changes [1]. Mild disco...

Intermittent Fasting Science: What Research Can and Cannot Tell You
5 min read

Intermittent Fasting Science: What Research Can and Cannot Tell You

Intermittent fasting science suggests that meal timing can change how the body uses energy, but it does not prove that fasting is automatically better...

Does Fasting Stimulate Growth Hormone?
8 min read

Does Fasting Stimulate Growth Hormone?

Yes, fasting can stimulate growth hormone in some controlled human studies, especially during longer fasts. But that answer needs a careful boundary:...

What happens to your body during prolonged fasting?
8 min read

What happens to your body during prolonged fasting?

During prolonged fasting, your body gradually shifts from using recently eaten food to stored glycogen, fat-derived fuel, and ketone bodies. Some cell...

What to Do About Dizziness While Fasting
10 min read

What to Do About Dizziness While Fasting

Feeling dizzy during a fast is usually a sign your body needs something simple: sugar, fluid, or salt, or you just stood up too fast. Stop what you ar...