16:8 Intermittent Fasting Schedule: 7 Plans With Clock Times

By Mustafa Tarabya, founder of DT Nova · Published 25 October 2026

A 16:8 intermittent fasting schedule means you eat within 8 hours a day and fast for 16, for example from 11 am to 7 pm. What changes the clock times is your day: the window follows when you wake, work and sleep, not someone else's lunch hour.

Cleveland Clinic gives that 11 am to 7 pm window and suggests starting the fast at least three hours before bedtime. Seven worked plans follow with clock times: early riser, 9-to-5, late riser, night shift, weekend, a 12:12 ramp-up week and a five-day week. Written by Mustafa Tarabya, founder of DT Nova, the studio that makes FastTrack.

Medical note: This is general information, not advice for you. Talk to a clinician first if you are pregnant or breastfeeding, or have diabetes or low blood sugar. The same applies to medication taken with food and to a history of an eating disorder. Children should not follow a fasting schedule.

How a 16:8 day works

Sixteen hours sounds heroic until you notice eight of them happen in bed. The real work is the morning before the first meal and the evening after the window closes.

The rules come from Cleveland Clinic's intermittent fasting guide. Its example is "Only eating between 11 a.m. and 7 p.m." It also says to "plan your fast to begin at least three hours before bedtime."

During the fast, "water, carbonated water, black coffee and unsweetened teas are all acceptable." Anything with calories ends it, which the does coffee break a fast guide works through drink by drink.

Plan 1: the early riser

Two papers back this timing. The PMC meta-analysis on 8/16 eating defined early eating as food intake that "started before 12:00 pm." A 14-week JAMA Internal Medicine trial in 90 adults with obesity used an "8-hour eating window from 7:00 to 15:00" alongside calorie cutting.

The free 16:8 timer in FastTrack counts down live, as do the free 18:6 and 20:4 timers. Premium adds custom windows from 1 to 23 hours, OMAD, the fasting stage timeline and statistics.

Plans for a working week

Plan 2: the 9-to-5

Plan 3: the late riser

Plan 4: the night shift

No source here tested night shifts, so this plan only moves the clock: fast through your main sleep.

Plan 5: the weekend

Cleveland Clinic's advice is to "Keep a similar eating and fasting window on the days you choose to fast." A Saturday brunch only needs the window moved by an hour or two, then moved back.

Starting slow, and a five-day week

Plan 6: a 12:12 ramp-up week

Jumping straight to 16 hours is the hard way to start. Cleveland Clinic lists a 14/10 method, "Only eating between 9 a.m. and 7 p.m.," which makes a natural middle step.

A custom 12-hour or 14-hour window is a Premium feature in FastTrack. On the free plan, the 16:8 timer still shows the elapsed hours, so you stop at 12 or 14.

Plan 7: five days on, two days relaxed

Cleveland Clinic says "Zumpano suggests fasting most days to see benefits." Five fasting days and a relaxed weekend is one way to read "most".

All seven plans side by side

If a weekday slips, FastTrack's streaks forgive the day you have not logged yet. You can also edit a past fast with a wrong start time.

What the evidence says, and what it does not

The PMC paper pooled "eight studies of 464 patients" with overweight or obesity. Each trial ran at least 4 weeks. Against eating with no time limit, 8/16 eating showed a weight difference of 1.48 kg, about 3.3 lb.

The authors found "no significant difference in lean mass change" and "no significant effect on other parameters of glucose metabolism and lipid profiles."

A larger 2024 meta-analysis in JAMA Network Open covered 29 trials and 2485 people. It found more weight loss with time-restricted eating, but said "the effect sizes found were small and of uncertain clinical importance."

In the JAMA Internal Medicine trial, the 7 am to 3 pm group lost more weight than a group eating over 12 or more hours. Both groups also cut calories.

On safety, the paper says: "No serious adverse effects were reported in any of the included studies." Cleveland Clinic lists the everyday downsides: "irritability, low energy, persistent hunger, temperature sensitivity, and poor performance at work and in other activities."

The National Institute on Aging is the most cautious voice: "In short, there's not enough evidence to recommend any such eating regimen to the public." So treat 16:8 as a timing structure that suits some people, not a promise about your weight. If you have blood work coming, a lab fast has stricter rules; see fasting before blood work.

Who should not follow this schedule

Cleveland Clinic says "Intermittent fasting isn’t safe for some people, including":

• People who are pregnant or nursing.
• People who are malnourished.
• People with hypoglycemia.
• People with certain chronic diseases.
• Children.

On eating disorders, it quotes Zumpano: "If you have a history of an eating disorder or are currently being treated for one, you shouldn’t attempt any sort of fasting diet without medical supervision."

Questions people ask

Sources

• Cleveland Clinic, Intermittent Fasting: What It Is, Benefits and Schedules, 2026.
• Time-restricted eating (8/16) meta-analysis, Food Science & Nutrition, 2023.
• Jamshed et al., early time-restricted eating trial, JAMA Internal Medicine, 2022.
• Liu et al., meal timing meta-analysis, JAMA Network Open, 2024.
• National Institute on Aging, Calorie restriction and fasting diets.