The answer to the question is Use the principle of the discretionary calorie allowance to plan their diet.
IIFYM should be used in conjunction with the concept of discretionary calorie allowance (DCA). If It Fits Your Macros, or IIFYM, stands for the principle that your body composition will not be affected by the foods you eat as long as you meet your macronutrient targets. Your body composition will be the same if you have 100g of protein, 50g of fat, and 150g of carbohydrates from fruits and protein powder as opposed to 100g of protein, 50g of fat, and 150g of carbohydrates from meat and potatoes.
IIFYM has a version called DCA. With DCA, you consistently meet your macronutrient objectives for protein and/or fat. There will be a few hundred calories left after you reach your protein and/or fat goals. You are those calories, DCA. As long as you stay under your daily calorie limit, you can eat whatever you want.
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