Supper
Feel free to keep your current supper and move it earlier. In controlled trials, people felt less hungry and had a lower glucose peak when they ate earlier.
As an experiment, try to move your usual supper 1 hour earlier and see what happens.
You can keep the food and portions the same because this is a test of timing. The human studies tested it this way.
What happens after supper
After supper, your body spends several hours digesting the meal and using or storing the energy it contains. As more time passes without food, insulin falls and the body begins to rely more on energy it has already stored.
This food-free stretch also affects autophagy, the process cells use to break down worn proteins and reuse their parts. In a human muscle study, signs of autophagy were higher after an overnight fast and fell within 90 minutes of eating a mixed meal. The study did not identify an ideal number of fasting hours. It showed how quickly another meal changes the process.
Moving supper earlier gives you more of this food-free time before breakfast without changing what you eat. Researchers tested that idea by serving the same meals at different hours.
Researchers served the same meals at different hours.
What changed when the meals moved later
In 2022, 16 adults with overweight or obesity lived through 2 laboratory schedules. Their meals were weighed, and their sleep, light and activity stayed fixed. On the later schedule, every meal arrived 250 minutes later.
On the later schedule, participants reported about 20% more hunger and used about 5% less energy while awake. In fat samples from 7 people, the later schedule shifted gene activity towards storing more fat and breaking down less.
A 2020 study of dinner alone is more useful here because the first trial also moved breakfast and lunch.
On separate visits, 20 healthy adults ate dinner at 18:00 and 22:00. They went to bed at 23:00 both times. Researchers marked part of the dinner's fat so they could follow what happened to it.
After the 22:00 dinner, glucose peaked 18% higher. By morning, about 10% less of the marked fat had been used for energy. The difference was largest in people who usually went to bed earlier.
| All meals, 2022 | Supper only, 2020 | |
|---|---|---|
| Participants | 16 adults with overweight or obesity | 20 healthy adults |
| Timing tested | Every meal moved 250 minutes later | The same dinner at 18:00 and 22:00 |
| What stayed fixed | Food, sleep, light and activity | Food and a 23:00 bedtime |
| Later schedule | Hunger about 20% higher; energy use while awake about 5% lower | Glucose peak 18% higher; about 10% less of the traced dinner fat used for energy |
These small laboratory studies point in the same direction without naming a perfect dinner time. The simplest home test is 1 hour earlier.
Try it for 1 week
If you normally eat at 20:00, try 19:00. Change only the time and feel free to keep the food and portions unchanged.
If you have a sweet tooth, the food principles explain how to choose a treat, and the Forbidden Fruit directory lists packaged options.
You can try this experiment even if you usually eat late. Notice your evening hunger and how comfortable you feel after supper.
For more ideas for better sleep, see the articles on darkness, overnight air and room temperature.
The short answers
The questions people ask most.
How many hours before bed should you stop eating?
There is no proven number that suits everybody. Try moving your usual supper 1 hour earlier for 1 week while keeping the food and portions the same.
Why leave a gap between supper and bed?
In controlled trials, people who ate earlier felt less hungry and had a lower glucose peak after dinner. An earlier supper also gives the meal a clear finish before sleep.
What is autophagy?
Autophagy is the way cells break down damaged or unnecessary material and reuse the parts. It happens at a low level all the time and can increase when nutrients are scarce.
How many hours of fasting does autophagy need?
Human research has not found an exact overnight threshold. In a study of 12 healthy young men with overweight, signs of autophagy in muscle fell within 90 minutes of eating a mixed meal.
Does meal timing matter if the food stays the same?
Yes. In a 2022 trial, 16 adults ate the same weighed meals on 2 schedules. They reported about 20% more hunger when every meal arrived 250 minutes later. Energy use while awake was also about 5% lower.
Why does eating earlier keep hunger steadier?
Participants reported less hunger on the earlier schedule. Their daytime levels of leptin, a hormone that helps signal fullness, were also higher.
Do you need to follow intermittent fasting?
No. You can keep every meal and portion and move supper earlier. You do not need to name or count a fasting window.
Why is the same dinner easier earlier?
In a 2020 trial, 20 healthy adults ate dinner at 18:00 and 22:00 on separate visits, with sleep fixed at 23:00. After the later dinner, glucose peaked 18% higher. About 10% less of the traced dinner fat had been used for energy by morning.
What can you drink after the kitchen closes?
Have plain herbal tea or water after supper.
How do you know an earlier supper is working?
Notice your evening hunger, how comfortable you feel after supper and how you feel at breakfast. Keep the earlier time if it suits you better.
Does this apply to everybody?
The 2 trials were small and studied different groups. Treat 1 hour earlier as a personal experiment and keep the timing that feels better.
The studies. Vujović N, Piron MJ, Qian J, et al. "Late isocaloric eating increases hunger, decreases energy expenditure, and modifies metabolic pathways in adults with overweight and obesity." Cell Metabolism, 2022;34(10):1486-1498. A randomised controlled crossover trial in 16 adults: meals delayed by 250 minutes increased reported hunger by about 20% and lowered energy use while awake by about 5%. Fat-tissue results came from 7 participants. doi:10.1016/j.cmet.2022.09.007 · PMID 36198293.
Gu C, Brereton N, Schweitzer A, et al. "Metabolic Effects of Late Dinner in Healthy Volunteers-A Randomized Crossover Clinical Trial." The Journal of Clinical Endocrinology & Metabolism, 2020;105(8):2789-2802. In 20 healthy adults, dinner at 22:00 rather than 18:00 produced an 18% higher glucose peak, and about 10% less of the traced dinner fat had been used for energy by morning. Sleep was fixed at 23:00. doi:10.1210/clinem/dgaa354 · PMID 32525525.
Morales-Scholz MG, Wette SG, Stokie JR, et al. "Muscle fiber type-specific autophagy responses following an overnight fast and mixed meal ingestion in human skeletal muscle." American Journal of Physiology-Endocrinology and Metabolism, 2022;323(3):E242-E253. A mixed meal reduced autophagosome content in muscle within 90 minutes in 12 healthy young men with overweight. doi:10.1152/ajpendo.00015.2022 · PMID 35793481.
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