Hi, thanks for writing to HCM.
I am glad that you are concerned about your health. It is very common to have leg pains due to being overweight
and I totally agree that losing weight is not that easy. With regards to diet, you will have to consume low fat, low cal, high protein, high fiber diet. However, since you have not mentioned your age and medical conditions, i would suggest you to eat healthy. Also, with regards to exercise, walking is a good cardio activity. However, walk consistently and do not stop in between. Do not strain your legs. Walk only as much as you can. Also check if the shoe/footwear is comfortable. Consult a good doctor for medications if necessary.