Hi, thanks for using healthcare magic With your history of knee and heart issues your mobility would be limited so it may be necessary to lose weight through dietary modifications. There are 2 main types of diets suggested : low fat/low calorie diet and low carbohydrate diet. The low fat/low calorie diet involves reducing the amount of fat ingested by using low fat items, increasing the proportion of fruits and vegetables ( at least 5 servings a day- with your main meals and using them at your snack time) and eliminating sodas and fruit drinks The low carb diet involves reducing the amount of carbohydrates used because carbohydrate intake results in increase fat in the body. IT involves reducing the amount of rice/bread/pasta/pastries/ starchy vegetables (potatoes for example), using vegetables and some fruits, using protein foods. In some cases it may be difficult to do this on your own so you have some options: (1)you can join an online weight loss program (2) you can consult a bariatrician (weight loss doctor)(3) join a weight loss forum online for support (4) consult a nutritionist I hope this helps and wish you the best