man that all applies to whatever you are going for and where you are at in life. Good place to start is 2000-2500 calories. 40/40/20 protein carbs fat. Write it all down and know what you are taking in. to use 500 cal more than consumed a day to lose a pound a week. I am currently eating low carb, 50g or less a day. Had really good results, 12 pounds in about 3.5 weeks. Try to time when i take in carbs to control insulin spikes. what are your stats, weight height bf%. How often do you train, what type of training? if you read up on Rosie's weight loss tips(do a search) she outlines it all and when you see her you will see she knows what she is talking about