TempoLife › Features › Nutrition myths, checked › carbs-after-6
Do not eat carbohydrates after 6pm.
The same slice of bread has the same energy at 18:01 as at 17:59. This rule works, when it works, by deleting a category of food from the part of the day when most snacking happens.
Verdict: Falseno carbs after 6evening carbscarb timing
The claim, as people state it
“Do not eat carbohydrates after 6pm.”
What is actually known
There is no mechanism that stores evening carbohydrate as fat while sparing morning carbohydrate. Glycogen stores are filled or not filled depending on how depleted they are, and the daily energy balance determines what happens to the surplus. Trials that move an identical carbohydrate load later in the day do not produce the fat gain the rule predicts; if anything, some find evening carbohydrate slightly favourable for sleep.
The rule does have a practical effect, which is why people report success. "No carbs after six" removes bread, pasta, rice, crisps, biscuits and most desserts from the six hours in which people eat most of their unplanned calories. That is a large deletion dressed up as a metabolic law.
What is left in the evening under this rule — protein and vegetables — is also the most satiating combination per calorie. So the rule stacks two real effects, fewer calories and better satiety, and attributes both to the clock.
The mechanism the rule usually leans on is insulin: carbohydrate raises insulin, insulin promotes storage, therefore evening carbohydrate becomes fat overnight. Each step is true in isolation and the conclusion still does not follow, because storage and release run continuously in both directions all day. What determines whether the day ends with more stored fat than it began with is the total, not the shape of the insulin curve within it. A person in a deficit stores fat after every meal and finishes the day with less of it than they started.
Why the myth persists
Because it is a rule that produces results, and results are what people evaluate a rule by. It also inherits authority from the low-carbohydrate movement generally, where a real mechanism (carbohydrate drives insulin) got stretched into a false one (therefore evening carbohydrate becomes fat).
The arithmetic
White bread carries 266 kcal per 100 g in the food database, so two slices of white bread (about 60 g) is 160 kcal. That figure is a property of the food. It does not consult a clock.
| Eaten at | Portion | kcal | kcal over 7 days |
|---|---|---|---|
| 17:00 | 60 g | 160 | 1 117 |
| 19:00 | 60 g | 160 | 1 117 |
| 21:00 | 60 g | 160 | 1 117 |
| 23:00 | 60 g | 160 | 1 117 |
Repeat that portion every evening and it is 1 117 kcal a week. At roughly 7 700 kcal per kilogram of body fat, an unmatched 160 kcal a day works out at about 7.6 kg a year — which is the actual mechanism people are noticing when they blame the hour.
kcal/min = MET × 3.5 × 75 kg ÷ 200 (ACSM)
Those minutes are computed at 75 kg using the ACSM equation above and the MET values behind every exercise page on this site. They do not change if you move the meal earlier, which is the whole point.
Every figure in this section was computed when this page loaded, from 5 237 food rows and 31 exercise rows already in this repository. Nothing in it is stored as prose.
The honest nuance
For people managing blood glucose, meal timing and composition genuinely do matter and the advice should come from their clinical team, not from a general rule found on the internet.
If evening carbohydrate is where your overshoot lives, cutting it is a perfectly sensible tactic. Just call it what it is — a portion strategy — so you know what to adjust when it stops working.
General information, not a diagnosis and not medical advice. Anything touching a condition you have, a medicine you take or a test result belongs with your own clinician, who has information no web page does.
Frequently asked questions
Do evening carbs affect sleep?
For some people a carbohydrate-containing evening meal is associated with falling asleep slightly faster. The effect is small and inconsistent, and a very large meal close to bed cuts the other way.
Should I eat carbs after evening training?
If you train hard in the evening, eating carbohydrate afterwards refills glycogen for the next session. The rule would have you skip exactly the meal that helps most.
Source: USDA FoodData Central (SR Legacy) via the TempoLife food database; MET values from the 2011 Compendium of Physical Activities · checked 2026-09-02
Work it out for yourself
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Stop guessing at your own numbers
Almost every myth on this site ends at "it depends on your total intake and your total movement". TempoLife records both, so the answer stops being a debate.