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?

Question

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

Approximately 75% of long-term diet-induced weight loss is fat and 25% is lean mass.

1) Relevant knowledge points and concepts
- Body weight comprises fat mass and fat-free (lean) mass (muscle, organs, bone, water, glycogen).
- During prolonged caloric restriction, the classical “one-quarter rule” (often attributed to Forbes and consistent empirical observations) states roughly 75% of weight lost is fat and 25% is fat‑free (lean) mass.
- The exact partitioning varies with starting body composition, rate of loss, protein intake, and resistance exercise, but the 75/25 split is the standard average for slow, sustained dieting.

2) Complete reasoning process step by step
- Use the empirical rule: for long-term dieting, 3 parts fat lost for every 1 part lean mass lost.
- This gives a ratio fat:lean of 3:1, which converts to percentages by dividing each part by total parts (3 + 1 = 4).

3) Calculations with intermediate steps
- Ratio: fat = 3 parts, lean = 1 part → total parts = 4.
- Percentage fat = (3/4) × 100% = 75%.
- Percentage lean = (1/4) × 100% = 25%.
- Example: if someone loses 8 kg over months, fat ≈ (75% of 8) = 6.0 kg, lean ≈ (25% of 8) = 2.0 kg.

4) Why the correct answer is correct
- The 75% fat / 25% lean rule is a well-established average for gradual, diet-only weight loss and reflects how the body mobilizes fat and some lean tissue when in sustained caloric deficit. It is supported by longitudinal studies and metabolic models showing a larger proportion of weight loss coming from adipose tissue in prolonged moderate deficits.

5) Why the other options are incorrect
- "25% fat, 75% lean mass" reverses the established proportions and would imply most loss is lean tissue, which is not typical for long-term dieting.
- "50% fat, 50% lean mass" overestimates lean loss and underestimates fat loss relative to observed averages.
- "30% fat, 70% lean mass" similarly implies an implausibly high proportion of lean tissue loss for prolonged dieting without extreme conditions.

6) Conclusion
This reasoning confirms the correct answer: 75% fat, 25% lean mass.

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?单项选择题

类似问题

In the past, people relied on height-weight tables that were based on insurance company mortality statistics, but these were inaccurate because

What is the primary reason why weight is not the most accurate metric to assess fitness, according to the New York Times article “How Fit Are You?”?

BMI is only an indirect indicator of body fatness and therefore will not accurately classify all individuals, specifically because it fails to distinguish between

According to experts, a percentage of body fat below the range of ________ is unhealthy.

The human body is made up of fat-free mass and

In the past, people relied on height-weight tables that were based on insurance company mortality statistics, but these were inaccurate because

Percent body fat classifications are significantly different for the two sexes. For example, a female could have a percent body fat that is “recommended” (or healthy) while the same percent body fat could be categorized as “obese” for a male of the same age.

The BMI measurement can overestimate obesity in which individual?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单