My question comes after having read this article.
Let's take a Person A and suppose the needed amount of calories for A is 2500 Kcal.
Now suppose A wants to limit the amount of daily calories to 2000 Kcal.
Given 2 diets (just as an example) of 2000 Kcal divided as follows:

  • 50% from proteins, 30% from carbohydrates and 20% from fats

  • 50% from fats, 30% from carbohydrates, and 20% from proteins.

Will the outcome be the same (I.e., weight loss in the same way) as stated in the article?

Ignoring the bad health effects of a diet with a wrong equilibrium how the composition does not matter if only considering weight loss?

  • 1
    If there is the same calorie deficit, it will be about the same weight loss, regardless of the macronutrient percentage (considering that the level of physical activity remains the same). A lot of studies about this have been published (low-carb or high-carb diet and weight loss, etc.). Different individuals may find a certain nutrient pattern easier to follow, though. And certain patterns may be healthier.
    – Jan
    Aug 27, 2018 at 9:52

2 Answers 2


Macronutrient (carbs, proteins, fats) composition of a diet does not have a significant direct effect on weight loss.

Comparison of Weight-Loss Diets with Different Compositions of Fat, Protein, and Carbohydrates (PubMed, 2009, a randomized clinical trial involving 811 overweight adults)

Reduced-calorie diets result in clinically meaningful weight loss regardless of which macronutrients they emphasize.

On the other hand, certain macronutrient compositions and forms may be associated with increased satiety (and hence lower food intake):

  • Solid, compared to liquid carbs (PubMed, 2011)
  • Foods high in fiber, such as whole-grain pasta, compared to refined-grain pasta (PubMed, 2016)
  • Foods high in viscous soluble fiber, such as whole-grain oats (PubMed, 2016)
  • Low-carb, high fat diets (PubMed, 2016)
  • Thank you for the clear answer and for the references, I'll check them out.
    – user14572
    Nov 7, 2018 at 14:36
  • Also look at ACLM website for additional research, much of which is digested for public consumption
    – DoctorWhom
    Nov 7, 2018 at 15:17
  • Any specific link?
    – Jan
    Nov 7, 2018 at 15:19

When it comes to losing weight, your eating habits and food choices matter a lot to achieve your fitness goals. You have to quit junk and unhealthy food and add healthy and nutrient-rich foods to your diet. No matter how many crunches or push-ups you can do in a day, if you will not fill your diet with healthy foods and break your unhealthy eating habits, then you are not going to maintain a healthy weight, quoting Explore Diet, a UK based blog here, that "By eating healthy, it can help you lose weight but in a meaningful way.