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Why Is My Body Fat Percentage Unexpectedly High?

How Total Body Water (TBW) Can Influence Your Result

If your body fat percentage (BF%) appears higher than expected, it does not always indicate an increase in body fat. In many cases, this change is related to total body water (TBW) rather than fat mass itself.

Evolt body composition technology estimates BF% using bioelectrical impedance. As a result, changes in hydration can influence how your results are displayed.

How Body Fat Percentage Is Estimated

Bioelectrical impedance analysis (BIA) measures how easily a small electrical signal travels through the body.

  • Lean tissue and water conduct electricity efficiently
  • Fat tissue offers greater resistance

If TBW is lower at the time of measurement, resistance increases and the device may calculate a higher BF%, even when fat mass has not changed.

The Role of Total Body Water (TBW)

TBW typically accounts for around 50–65% of total body weight, varying by age, sex, and body composition. Short‑term changes in TBW can cause noticeable shifts in BF% readings.

A reduction in TBW can make your BF% appear unexpectedly high.

Common Factors That Decrease TBW

1. Dehydration

One of the most frequent causes of elevated BF% readings.

  • Low fluid intake
  • Hot or dry environments
  • Alcohol or excess caffeine consumption

2. Illness or Inflammation

Temporary fluid loss or redistribution can occur due to:

  • Fever
  • Gastrointestinal illness
  • Acute inflammation

3. Reduced Carbohydrate Availability

Carbohydrates are stored in the body as glycogen, which binds water.

  • Low‑carbohydrate diets
  • Fasting
  • Extended endurance exercise without refuelling

Reduced glycogen stores typically result in lower TBW.

4. Hormonal Variability

Hormonal fluctuations can influence fluid balance, including:

  • Menstrual cycle phases
  • Menopause
  • Elevated cortisol from stress

5. Sleep Deprivation or High Stress

Poor sleep and ongoing stress can:

  • Alter fluid regulation
  • Increase cortisol
  • Reduce intracellular water

Measurement Conditions That May Influence Results

TBW and BF% readings may also vary if:

  • Measurements are taken at different times of day
  • Exercise occurred shortly before scanning
  • There has been significant sweating or sauna use
  • Measurement conditions are inconsistent

Unrealistic Negative Result

 

Total Body Water Decrease Explanation