I don't know your weight so cannot comment on what the exact situation is. However, as mentioned by you, you are overweight. Having a slow metabolic rate, which is one of the reasons for being overweight makes the body lethargic. For maintaining metabolism levels and initiate weight loss, you must:-
a) Follow a strict dietary regime and set you body clock right
b) Have small frequent meals and do not skip meals
c) Not compromise on nutrition while trying to lose weight
d) Have foods in the right combination to build up on your immunity and not cause weight gain
Next Steps
You need to include nutrient dense foods in your diet. Have lots of seasonal fruits and vegetables. Add lemon over your salads and vegetables to increase iron absorption. Have healthy nuts like almonds and walnuts.
Health Tips
You can contact me on direct consult for more actions points on what food combinations to have to reduce weight and not compromise on your immunity and energy levels. You can also visit me to get a customised diet plan.