Method

In short

Almost every cell in the body runs its own rhythm of about 24 hours, and a master clock in the brain keeps them in step using light. When meals, light and sleep line up with that rhythm, the body handles sugar better, falls asleep more easily and keeps steadier energy. BioRitam teaches you to arrange your day that way, without fasting and without counting calories.

Three anchors of the day

1. Light: outdoors in the morning, dim in the evening

Daylight is the strongest signal to the body clock. When people spend their days in natural light, their internal clock moves earlier and lines up better with the day [1]. Ordinary room light before bed, on the other hand, delays and shortens melatonin [2]. Hence two rules: 15–30 minutes outdoors in the first hour after waking, and dim, warm light for the two hours before sleep.

Evidence: Moderate evidenceHow we rate evidence

2. Meals: weight of the day early, dinner three hours before sleep

The body handles the same meal better in the morning than in the evening: blood sugar after the same meal rises more late in the day, partly because of the internal clock itself [3]. In controlled trials, an earlier eating window improved insulin sensitivity and blood pressure [4, 5], and a late dinner raised blood sugar more than the same dinner eaten earlier [6]. So our frame is an eating window of about 10 hours, with a bigger breakfast or lunch and a lighter dinner.

What the studies don't show matters too: with calories matched, time-restricted eating often brings no more weight loss than plain calorie reduction [7]. That's why we don't promise kilos, but steadier energy and blood sugar.

Evidence: Moderate evidenceHow we rate evidence

3. Sleep: the same wake time, and a coffee cut-off

Coffee taken even six hours before bed measurably shortened sleep [8], and a 2023 review puts the safe gap for a standard cup at about nine hours [10], so our cut-off is nine hours before sleep. When you wake much later at weekends than on workdays, your body goes through a small jet lag every week [9]. A steady wake time is the first anchor we set.

Evidence: Early evidenceHow we rate evidence

What we don't do

• We don't promise kilos or deadlines. We promise a schedule you can keep.
• We don't ask you to starve. The eating window is wide and follows your wake time.
• We don't diagnose and we don't replace your doctor. The content is educational.
• We don't present guesses as facts. Every claim has a source and a rating of how strong the evidence is.

Where to start

The quickest first step is the Rhythm Map: ten questions and a map of your day in two minutes.