Keep calm and carry onStress can lower testosterone, likely by elevating levels of the hormone cortisol. This affects the pituitary gland and hypothalamus, which regulate testosterone output. Getting enough sleep and managing tension in other ways (such as these breathing exercises) can help maintain healthy T levels. [sidebar]Flex your musclesExercise reduces stress, elevates mood, and aids weight loss—and studies show that resistance training in particular (e.g., doing squats and biceps curls or using resistance bands) can trigger a temporary boost in testosterone. Rest 1 1/2 to 2 minutes between sets for the most benefit. Eat smartLow levels of vitamin D have been associated with low testosterone, so eat D-rich foods such as salmon and drink fortified milk or orange juice. Studies also show that men who eat plenty of monounsaturated fats—found in avocados, olive oil, and nuts—tend to have higher T levels. Warning signs of low testosterone

OverweightDepressedOvertiredRarely in the mood for sex

More from Prevention: Science-Backed Ways To Stabilize Testosterone