GoBe U: Why Is My BMR Much Lower or Higher on Certain Days?

If your basal metabolic rate (BMR) in the app seems noticeably lower or higher on one day compared to another, this is not necessarily a sign of a problem. BMR naturally fluctuates, and several factors can influence it.

BMR Is Dynamic - Not Fixed

Your BMR reflects the number of calories your body uses to maintain essential functions at rest. While some factors, like age and sex, are stable, others can vary daily or seasonally, which affects the BMR calculation.

Here’s what can influence day-to-day BMR changes:

1. Physical and hormonal activity

BMR is affected by your level of physical activity and shifts in hormonal balance. Even if your weight hasn’t changed, a more or less active day can lead to changes in metabolic intensity.

2. Food intake and digestion

Eating and digesting food temporarily increases your metabolism, especially when consuming protein. This is known as the thermic effect of food. On days when you eat more or eat high-protein meals, your BMR may increase accordingly.

3. Dietary restrictions or overconsumption

Periods of fasting, strict dieting, or overeating can impact how your body processes energy and can cause your BMR to fluctuate.

4. Ambient temperature

External temperature plays a role as well. When your body is exposed to colder environments, it works harder to maintain internal temperature, which increases BMR. A similar increase is not observed to the same extent in warmer temperatures.

5. Wearing time of the band

If you only wore the band for a few hours on one day, but for the entire day on another, the amount of data collected will differ significantly. Shorter wearing time may lead to incomplete or less accurate BMR data. For consistent results, we recommend wearing the band 22–23 hours per day, removing it only for charging.

Summary - What Affects BMR Changes Day to Day

• Physical activity level

• Hormonal changes

• Meal composition and digestion

• Fasting or dietary imbalance

• Ambient temperature

• Incomplete data due to limited wearing time

To get the most reliable BMR data, try to wear your GoBe band continuously each day and sync the device regularly.

If you have further questions or need help reviewing your data, don’t hesitate to contact us - we’re happy to assist.