Doing the 21 Day Fix can produce some amazing results if you follow the program correctly. In fact, the program is one of the best in regards to ensuring proper portion control and fitness routines, so much so, that it is one of the most programs I recommend most often. Find me at www.susanorehowsky.com
This is what 100 calories look like. I've made this food chart for my gramma who is trying to lose weight. This is an outline of 60-100 calorie food portions with their corresponding macro nutrients. I figured other people may find this helpful. Just print it out and do as you wish with it.