The problem
Why most food burns fast
A quick lift, then it wears off. Here is what that costs you, and the studies that show it.
Energy crashes
Fast carbs and big plates make you tired
The slump is not in your head. Three lines of evidence put it on the plate.
01
Tired within the hour
Carbs lower alertness and raise fatigue in the first hour, measured against a placebo.
Placebo-controlled, so it is the food, not the expectation.
Mantantzis et al., 201902
Big plates make you sleepy
A heavy lunch drags from half an hour in. A high-fat lunch is as drowsy as a high-carb one.
Sleepiness read on the brain, not in a questionnaire.
Reyner et al., 201203
The cost lands late
A big carb load dulls attention after two hours. Fast sugar drains energy at four to five.
Two designs agree on the timing: nothing early, a real difference late.
Gaylor et al., 2022; Dammann et al., 2013Cravings
The dip after sugar is where cravings start
Two to three hours after a sugary food, blood sugar drops below where it started. That drop is a hunger signal.
01
The dip predicts hunger
The drop below baseline predicts hunger and the next meal better than the peak does.
The largest study of its kind in people without diabetes.
Wyatt et al., Nature Metabolism, 202102
Sugar dips, starch does not
Sugary foods fall below baseline by two hours. Starchy foods stay above it.
The reference database the whole field uses.
Brand-Miller et al., 200903
Replicated in 2026
Any dip brings the next meal about 27 minutes sooner. More than half of everyday meals dipped.
An independent group, real-life meals, the same answer.
Yao et al., JAMA Network Open, 2026You eat more
The people who dip the most eat the most
Not a willpower problem. The same dip that brings hunger back brings the next meal forward and makes it bigger.
01
About 312 more calories a day
The biggest dippers ate 75 more calories at the next meal and 312 more over the day.
Logged, not recalled. The dip explained it better than the peak.
Wyatt et al., Nature Metabolism, 202102
More dip, more hunger
Every 10 percent deeper dip adds hunger at two to four hours and brings the next meal sooner.
A dose response, step by step, is hard to get by chance.
Yao et al., JAMA Network Open, 202603
Eating, not tiredness
The dip predicted eating. Its link to alertness was small and not significant.
Why the card says you eat more, and never says weight.
Wyatt et al., Nature Metabolism, 2021Your health
Meal after meal, the pattern is linked to your health
Large population studies. They show a link, not a cause, and we say it that way.
01
Linked to heart disease
High glycemic index diets are linked to more heart disease and earlier death, also in people who had none.
One of the largest diet studies ever run. The link held in every region.
Jenkins et al., NEJM, 202102
Step by step
The higher a diet's glycemic load, the higher the risk.
A dose response across many studies separates a link from a one-off.
Livesey et al., 201903
The after-meal rise
Blood sugar two hours after a meal is linked to low-grade inflammation. Fasting blood sugar is not.
It points at the part of the day food decides.
Sun et al., 2024Straight up
What we do not claim
The page stops where the evidence stops.
The dip does not make you tired.
It makes you hungry. The tiredness comes from fast carbs and the size of the plate.
No food fixes the afternoon slump.
Part of it is your body clock. Food can make it worse, or not.
Nothing here is about weight.
The evidence is about eating more, and that is where we stop.
No number for how you will feel.
Bazu ranks foods against each other. It does not forecast your day.
Not a medical claim.
Bazu rates food. It does not prevent or treat anything.
For informational use only. Not medical advice. Every source behind Bazu is on the research page.
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