The IIFYM Diet - Success or Failure?
Tim Klein
2026-03-22
6 min. read
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The IIFYM diet is becoming increasingly popular. What it encompasses and what it is? In this article, we will delineate its fundamental rules and potential outcomes that can be attained through it. Judge for yourselves.
Diet IIFYM – What is its fundamental principle?
IIFYM is an acronym for 'if it fits your macros'. This diet is also known as flexible dieting. As the name suggests, the main objective is to meet the body's demand for the three main nutrients – protein, fat, and carbohydrates. This method of eating allows for a great deal of freedom as it does not necessitate providing adequate amounts of vitamins and minerals. It suffices to provide an appropriate, pre-calculated level of energy during the day that matches the three mentioned nutrients. Individuals who follow this diet are required to count calories, yet there are no restrictions regarding the sources from which they should be obtained. The IIFYM diet also does not specify the number of meals per day. By utilizing various applications that aid in calculating the nutrients, the diet can be controlled according to the guidelines established at the outset. It is beneficial to commence with calculating the appropriate calorie intake. The simplest method is to use the Harris-Benedict formula – calculate the basal metabolic rate (BMR), followed by multiplying the obtained result by the coefficient of physical activity (PAL). The basal metabolic rate is the number of calories essential for maintaining the basic life functions of the body.
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