If one was to lose weight from dieting over a long period of time, approximately what percentage of the lost weight would be fat and lean mass?

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If one was to lose weight from dieting over a long period of time, approximately what percentage of the lost weight would be fat and lean mass?

BlackTom AI · Accepted Answer

When considering how body composition changes during a long-term weight loss from dieting, different proportions of fat and lean mass can be lost depending on factors like activity, protein intake, and training. 
Option 1: 30% fat, 70% lean mass. This would imply the majority of weight lost is lean tissue, which is unlikely in a typical dieting scenario aimed at fat loss; it would raise concerns about preserving muscle, and most diets do not disproportionately spare fat to this extent. 
Option 2: 75% fat, 25% lean mass. This aligns with common estimates from many weight-loss studies where the majority of weight lost is fat, with a smaller portion coming from lean mass (muscle and other lean tissues). While exact percentages vary, 75/25 is a frequently cited approximation for fat-to-lean loss during dieting without aggressive resistance training. 
Option 3: 25% fat, 75% lean mass. This would indicate most weight lost is lean tissue, which contradicts the goal of preserving muscle during fat loss and is not supported by typical dieting outcomes. 
Option 4: 50% fat, 50% lean mass. A 1:1 split suggests an equal loss of fat and lean tissue, which is not the standard expectation for a diet-focused weight loss unless specific interventions are used to preserve lean mass or if the diet markedly lacks protein or resistance training. 
In summary, among the given choices, the pairing of 75% fat and 25% lean mass most closely matches the commonly taught expectation for the composition of weight lost during dieting, with fat revenue comprising the larger share and lean mass comprising a smaller share.

FOOD20003_2025_SM1 Exam: Intro to Food Science & Human Nutrition (FOOD20003_2025_SM1)

If one was to lose weight from dieting over a long period of time, approximately what percentage of the lost weight would be fat and lean mass?

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