anything that causes stress, be it sudden increase in exercise
level, increase in
anxiety, poor sleep will cause an excess of
the body which may be the cause of weight gain initially.But once you continue exercising, the cortisol level stabilizes, your bmr rises and you will lose weight. When you diet, you need to take more protein and less carbs. Dont be on only salads.Dont exercise to lose weight. Do it as a part of a routine, and for the fun of it.