During intense military training, women tend to eat more calories than men, but both end up with similar energy deficits, suggesting their bodies may process or use energy differently.

Pro

Against

Mechanism

Synthesis from 1 study

How it works

Female soldiers eat more than males during intense training, but both lose the same amount of energy — this suggests women’s bodies may burn less energy at rest or during daily activity, conserving calories more efficiently, as seen in 10.1249/mss.0000000000004013.

Most probable mechanism

In Simple Terms

When female soldiers eat more food during intense training, their bodies may use that energy more efficiently — meaning they burn less of it as heat or for basic functions — so even though they eat more, they still lose the same amount of energy as men. This is suggested by the fact that women eat more but end up in the same energy deficit as men, as seen in 10.1249/mss.0000000000004013.

Causal chain

Female soldiers increase dietary energy intake to a greater extent than male soldiers during prolonged military training, yet both sexes achieve similar magnitudes of negative energy balance, indicating a difference in how energy is utilized or conserved.

Verified by multiple studies

which leads to

Metabolic efficiency may increase in females during energy deficit, reducing resting metabolic rate or non-exercise activity thermogenesis relative to energy intake, allowing greater energy conservation despite higher intake.

Indirect evidence only

which leads to

Hormonal adaptations, such as lower leptin and higher ghrelin levels in females under energy stress, may promote energy conservation by reducing thermogenesis and increasing appetite drive, aligning with observed intake patterns and energy balance outcomes.

Indirect evidence only

Evidence from Studies

Supporting (1)

Community contributions welcome

Limited Sex Differences in Energy Balance and Body Composition during 61+D of US Army Ranger Training

Cohort Study

Human

2026 Apr 27

Contradicting (0)

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Limited Sex Differences in Energy Balance and Body Composition during 61+D of US Army Ranger Training

Score: 46

DOI: 10.1249/mss.0000000000004013

Similar Assertions

Male and female soldiers experience the same degree of energy deficit during intense military training, even though their total food intake and energy use differ, suggesting that the body's regulation of energy balance operates similarly in both sexes under extreme physical stress.

87%

When male and female soldiers undergo the same intense military training for over 61 days with similar calorie deficits, men tend to lose more total body weight, while women preserve more muscle and lean tissue.

84%

During the beginning of intense military training, male soldiers burn more calories per day than female soldiers, but by the end of training, both sexes burn similar amounts of energy, indicating that the body adjusts its energy use over time.

84%

Men and women soldiers start with different body compositions: men typically have more total body weight and lean tissue, while women have more body fat. These differences remain during intense military training, except for body fat, which becomes similar between genders by the end.

71%