Protocolsfasting
fastingModerate

Intermittent Fasting Clinical Protocol

Clinical approach to intermittent fasting with several options (16:8, OMAD, alternate-day, 5:2).

Evidence Score

68/100

Developer

Jason Fung, Valter Longo, Satchin Panda

Duration

Adapt in 2 to 4 weeks; benefits within 4 to 12 weeks; ongoing lifestyle

Steps

28 phases

Used for

3 conditions

Protocol Overview

Clinical approach to intermittent fasting with several options (16:8, OMAD, alternate-day, 5:2). Used for weight loss, type 2 diabetes and insulin resistance, and general metabolic health.

Used For

Weight losstype 2 diabetesinsulin resistance

Key Resources

The Complete Guide to Fasting by Jason Fung, "The Longevity Diet" by Valter Longo, "The Circadian Code" by Satchin Panda, intermittent fasting trials

Safety Profile

Contraindications & Risks
Eating disorders, underweight, pregnancy or breastfeeding, children and teens, type 1 diabetes (needs close medical supervision). If you take insulin, sulfonylureas, SGLT2 inhibitors or blood pressure medication, your prescriber adjusts them first. Some medications must be taken with food
Important Notes

Intermittent fasting is one of the most studied fasting approaches. For most of history people ate without constant access to food. Randomized trials show intermittent fasting produces weight loss and improvements in insulin, blood pressure and lipids, with results generally similar to daily calorie restriction; some people find it easier to stick with. Satchin Panda's research on circadian rhythms suggests that eating earlier in the day suits the body clock, and early time-restricted eating improved insulin sensitivity in small trials. 16:8 is a sweet spot for many: long enough to lower insulin, short enough to sustain. OMAD and alternate-day fasting are harder to keep up and make it harder to meet protein and nutrient needs. During a fast, glycogen is used up after about 12 to 16 hours, insulin falls, fat burning and ketones rise, and growth hormone increases; autophagy is well shown in animals but less measured in people. For type 2 diabetes, fasting can improve blood sugar and some people need less medication over time, which Jason Fung's clinic reports. Any change to diabetes medication is made by your prescriber, because fasting on insulin or sulfonylureas can cause dangerous lows. Valter Longo's research connects fasting to aging pathways, mostly from animal studies. It is free, needs no special foods, and is a useful tool for metabolic health.

Find a Practitioner

Gabriel can find and book a practitioner who works with this approach.

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EvidenceModerate
Evidence Score68/100
Categoryfasting
DurationAdapt in 2 to 4 weeks; benefits within 4 to 12 weeks; ongoing lifestyle

About Evidence Score

The Evidence Score (0 to 100) rates the strength of evidence from studies in people for the uses listed: higher means stronger, more consistent research. It does not measure safety. It is not medical advice.

For education, not medical advice. Talk with a licensed clinician before you start, and never stop or change a prescribed medication without your prescriber.