Fasting & meal-timing approaches
16:8 fasting
The most popular time-restricted pattern: a 16-hour daily fast with an eight-hour eating window, such as noon to 8pm.
What people typically eat
Two or three balanced meals inside the eight-hour window; zero-calorie drinks outside it.
What is restricted
All calories for 16 hours daily, which usually means skipping breakfast or dinner.
Why people try it
A simple daily routine that many people find easier than counting calories.
Realistic advantages
- The easiest fasting pattern to make habitual
- Built-in structure removes evening grazing
- No special products, foods or costs
Realistic disadvantages
- Morning hunger and reduced training performance for some people
- Meal quality still matters, 16:8 does not fix a poor diet
- Evidence is largely short-term and shows modest effects
Strength of evidence
Limited evidence
Popular but thinly studied as a specific protocol; extrapolated from broader intermittent-fasting research.
Key studies
- TREAT trial: Lowe et al., JAMA Internal Medicine, 2020. A 16:8 eating window on its own produced no significant extra weight loss against three structured meals a day.
Likely cost and difficulty
Low cost; moderate difficulty.
Nutritional risks
Low for healthy adults.
Who should avoid it
As for intermittent fasting generally: pregnancy, adolescence, eating-disorder history, medication requiring food.
Is professional supervision advisable?
Not usually required for healthy adults.
References
Written by the Slimr editorial team. How we review diets.
