Is IIFYM?
IIFYM (If It Fits Your Macros — "if it fits your macros") — is a nutrition philosophy according to which what matters is not WHAT you eat, but HOW MUCH protein, carbohydrates and fat you consume per day. If by the end of the day your macronutrient targets are met and your calorie limit is not used up — you can eat a piece of chocolate or pizza without guilt.
IIFYM is not an "eat whatever you want" diet. It is a flexible approach to nutrition, which emphasizes that 80% of calories should come from valuable, nutritious food, and 20% can come from anything. This helps maintain psychological sustainability in the long term.
📋 How to Start IIFYM? 4 Steps
- Calculate your TDEE. This is your calorie reference point.
- Set your goal. Weight loss: −300–500 kcal. Maintenance: TDEE. Mass gain: +200–300 kcal.
- Distribute your macronutrients. Standard distribution: protein 25–35%, carbohydrates 35–50%, fat 20–30%. Protein target: 1,6–2,2 g/kg.
- Track your food in an app. MyFitnessPal, Cronometer, YAZIO. For the first 2 weeks, weigh EVERYTHING. After that, you can estimate "by eye".
🧮 IIFYM Macronutrient Distribution Examples
| Goal | Calories | Protein | Carbohydrates | Fat |
|---|---|---|---|---|
| Weight loss (woman, 65 kg) | 1600 kcal | 130 g (33%) | 160 g (40%) | 48 g (27%) |
| Weight loss (man, 85 kg) | 2100 kcal | 170 g (32%) | 210 g (40%) | 65 g (28%) |
| Maintenance (woman, 60 kg) | 2000 kcal | 120 g (24%) | 225 g (45%) | 68 g (31%) |
| Muscle gain (man, 80 kg) | 3000 kcal | 175 g (23%) | 375 g (50%) | 90 g (27%) |
⚖️ IIFYM Pros and Cons
✅ Pros
Flexibility — there are no "forbidden" products. Sustainability — easier to stick to long term. Sociability — you can eat at restaurants. Educational — you learn food composition.
❌ Cons
Requires weighing and tracking. "IIFYM" can turn into a "junk food" diet if the 80/20 rule is ignored. Micronutrient (vitamin, mineral) deficiency if you do not eat a varied diet.
💊 IIFYM and Sports Supplements
In the context of IIFYM, supplements are tools for reaching macronutrient targets:
- Whey protein — a quick and convenient way to reach your protein target (especially after training or while traveling). One serving = 25 g protein, only 120 kcal.
- Casein — slow-digesting protein before bed. Supports amino acid levels in the blood throughout the night.
- Creatine — although it does not provide calories, it improves training results, which indirectly helps achieve body composition goals.
- L-Carnitine — helps transport fatty acids into mitochondria, where they are burned for energy.
💡 Practical Everyday Tips
📋 Track Progress
Use a diary or app. Weekly trends are more important than daily fluctuations. Regularly measure not only weight but also circumferences.
💧 Drink Enough Water
2–3 liters per day. Water aids digestion and metabolism and reduces false hunger.
😴 Sleep 7–9 Hours
Quality sleep is essential for hormonal balance, muscle recovery, and appetite control.
🏃 Move Every Day
Even 30 minutes of walking per day can significantly improve metabolism and mood.