Demographics like sex, age, height and weight are not given to find out your BMI. Anyway there are lot of things which may block the good effects on body viz stress, improper food, sleeplessness. Tiredness may be due to other factors and also due to worm infestation, anemia, sedentary life. Hence I recommend balanced diet(no junks) with lot of whole fruits and fresh vegetables, timed food, regular physical activity ( walking / yoga ) amd eight hours sleep which will definitely make you bubbly and active.