No food in isolation causes weight gain
Yes you can eat too much of one or more to put you into that weight gaining phase and normally it will be from carbs and/ or fats because let's be honest they are delish, easily accessible & it's very
Progressive Overload
If you are arseing in the gym jumping from exercise to exercise, thinking I'll do this today and a bit if that tomorrow, with no idea of what weight you did last week or how many reps of a certain