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To mimic this environment, the experiment is separated into three phases, where participants operate on a calorie-deficit diet and perform rigorous physical activity.

Subjects are then given an injection of either testosterone or a placebo and are monitored to see the effects of the hormone.

When soldiers burn more calories than they consume, they begin to lose weight over time.

Losing weight means a loss in muscle mass and fat, which affects their mental and physical performance and can lead to a drop in testosterone levels, Rood said.

The IR program focused on the horrors of the twentieth century: the disappearances in Argentina, the war in Yugoslavia, the genocide in Rwanda, Stalin's great purges, the Holocaust, etc.