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Protocol

Intermittent Fasting

Eating only within a set window each day, for example 8 hours, and fasting for the rest. Also called time-restricted eating.

Intermittent Fasting

Evidence-backed benefits

How Intermittent Fasting can help, goal by goal, with the studies behind each score.

Fat Loss

26XP

People lose about 3 kg compared with eating freely, but no more than with ordinary calorie cutting: the loss comes from eating less.

Studies1234

How to read XP

Each score is for this protocol and that specific goal, not a general rating.

XP combines how reliable the research is with how much difference it usually makes. Higher means stronger evidence for that protocol and that goal.

Limited<15 XPModest15–27 XPModerate28–44 XPReliable45–69 XPHigh70+ XP

How to do it

Every day, with all your meals inside a window of about 8–10 hours, for example 10 am to 6 pm.

  1. 1

    Pick an eating window

    8–10 hours. Many people choose to skip breakfast or an evening snack.

  2. 2

    Stick to water, plain tea or black coffee outside it

    Nothing with calories.

  3. 3

    Eat well inside the window

    Protein, vegetables and enough food. The trials did not show it works if you overeat.

  4. 4

    Keep it consistent

    The same window most days.

  5. 5

    Stop if you feel unwell

    Dizziness, a pounding heart or constant preoccupation with food are signs to ease off.

The good-enough version

Stop eating three hours before bed and wait until mid-morning for the first meal.

Common mistakes
  • Overeating inside the window
  • Fasting hard while doing heavy training
  • Skipping protein
  • Using it if you have a history of disordered eating

Your journey

Weight changes show over weeks. The trials found no extra loss compared with normal calorie control. An estimate from the studies' timelines, not a promise: everyone responds differently.

Fat Loss
Week 2 → Week 12

From the first noticeable effect to roughly full strength. Colour follows the XP tier of each benefit.

Make it a habit

These gains come from steady use, not a single dose. Keep Intermittent Fasting in your routine for about week 12 before you judge it.

Safety

What to know before you try Intermittent Fasting.

Safety rating

Use with care

Dose and timing matter.

  • Possible muscle lossOne trial found a drop in lean mass with time-restricted eating, so keep protein high and keep lifting.
  • Early side effectsHunger, headaches and low energy are common at first and usually ease after a week or two.
  • Not for everyoneAvoid it if you have ever struggled with disordered eating.

Check with a doctor first if you have diabetes or take blood-sugar or blood-pressure medicines, are pregnant or breastfeeding, are under 18, are underweight, or have a history of an eating disorder.

General information, not medical advice. If you are pregnant, take medication or have a health condition, check with a doctor or pharmacist first.

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