I almost always recommend keeping a food diary when you are thinking of adjusting your diet. People tend to be more successful when they try to make one or two changes at a time. If you try to change too many things, it can become overwhelming and hard to stick with. When you do a food diary, you can see if there are some simple things to change or patterns you can work on. Food diaries can help point out, for example, if are you getting a lot of extra calories from beverages, or if it seems like you always want to snack before lunch or before bedtime. You can then take your food diary into your primary care doctor and you can confer about one or two goals for you to start working on.