Protein consumption beyond daily requirements does not automatically convert into body fat.

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Professor Stuart Phillips, an expert in exercise physiology, highlights a metabolic mechanism that is often misunderstood: the conversion of protein into fat (gluconeogenesis followed by de novo lipogenesis) is an energy-expensive and inefficient process in humans. Research, including randomized controlled trials (RCTs) published in the Journal of the International Society of Sports Nutrition, shows that high protein intake, even in a caloric surplus, favors lean mass or thermic oxidation more than direct adipose storage. The idea that 'any surplus becomes fat' is an oversimplification of the laws of thermodynamics. Although the overall energy balance remains the determining factor for weight gain, the body processes protein differently than carbohydrates or fats. It is therefore scientifically accurate to state that the direct transformation of protein into fat is marginal in a normal metabolic context.

the sources

1. 1Hall KD, Heymsfield SB, Kemnitz JW, et al. 2012
2. 2Rolls BJ 2009