If you eat too little protein while restricting calories for weight loss, you’ll lose more muscle than you would if you had eaten an adequate amount.9 If you eat too few carbohydrates while in a calorie deficit, your training will suffer, your muscle repair will be impaired, and your hormone profile will become more catabolic.10 If you eat too little dietary fat, you can experience a significant drop-off in testosterone levels and other undesirable effects.
