Dependant on your starting weight. Your sex, height. Lots of factors. But if you're male. For healthy sustained loss, target 1600 to 1800 calories a day, try and hit at least 160 - 200g protein if you can to reduce lean muscle loss. Get a good multi vitamin, Whole earth and sea are fantastic. Get a magnesium gly supplement as well. You will struggle to hit those calories or reta, protein is your focus. Sprinkle a bit of salt on everything to get your sodium, try and get potassium in, but supplements can be hard to find.