Checking with your doctor is always a good start. From there, simple things like walking for starters is a great place to begin exercising again. Start small, then you can increase the distance and pace as you begin to feel better.
As for diets, most people understand what a healthy diet consists of. (Speaking for myself, it takes incredible will power to stick with a diet.) For a lot of people, portion control is key. For others, caloric intake. For even others, it's carbohydrates..... My suggestion with dieting is, drink more water daily and drink a good sized glass of ice water about 10 minutes before each meal. Be prepared with the healthiest choices for food, and perhaps prepackage your meals in appropriate sized meals.
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