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Carb, Protein, and Fat Ratio For Weight Loss and Muscle Gain

A Dietitian Explains the Macro Breakdowns You Should Follow to Lose Weight and Build Muscle

When people are looking to get into shape, they are usually thinking about shedding fat and building lean muscle. And while it's possible to do both at the same time, how your nutrition fits into this equation is a little trickier. After all, when you lose weight, you inevitably lose a little bit of muscle. On the flip side, as you gain muscle, the number on the scale will go up.

We spoke to Jim White, RDN, ACSM, owner of Jim White Fitness and Nutrition Studios, to see what your macronutrient (carbs, protein, and fat) breakdown should be if you're trying to lose fat and gain muscle.

"This can vary depending on each person's own goals and measurements. Ideal macronutrient breakdown will vary from person to person, as there are a variety of factors that go into calculating the optimal ratio," he told POPSUGAR. He added that if you're trying to gain muscle mass, you probably won't lose weight because muscle causes overall weight gain. Instead, as you lose fat and gain muscle, your weight may more or less stay the same. Moral of the story: don't get too hung up on the number on the scale. Focus more on losing fat, gaining muscle, and how you feel in your body.

He broke down what your carb, protein, and fat ratio should be if you're trying to lose weight and also if you're trying to gain muscle. Of course, exercise is also an important factor in transforming your body, which will require more carbs to fuel your muscles.

To Lose Weight

"For weight loss, we typically try to increase protein and fat intake and decrease carbohydrate intake," Jim explained. "Protein increases a person's metabolism. With a decreased carbohydrate intake, the body has less fuel to use to get through a high-intensity workout. An increased fat intake allows the body to start using fat as the main source of energy, and thus, is burned more so than any of the other macronutrients."

For weight loss, he recommends a general macro breakdown of 40 percent carbs, 30 percent fat, and 30 percent protein.

Image Source: POPSUGAR Photography / Sheila Gim

To Build Muscle

"For muscle gain, a high carbohydrate diet is preferred, so that is the main source of energy that muscles will use," he said. "So, the opposite of weight loss carb-protein-fat ratio is recommended here. A diet that is higher in carbohydrates, and lower in protein and fat, is ideal."

To build muscle, he recommends a general macro breakdown of 55 percent carbs, 25 percent protein, and 20 percent fat.

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