Assertion

Rapid weight loss can lead to a decrease in metabolism.

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Explained

The text explains that when calories are restricted, the body's metabolism slows down to conserve energy. This can lead to a decrease in the number of calories burned, making it harder to lose weight and maintain weight loss. The text cites a study that found a 17-20% reduction in metabolism in just 13 days of calorie restriction.

Context for Assertion

The context of this assertion is the discussion of weight loss and metabolism, and how rapid weight loss can have negative effects on the body.

Concepts for Assertion

Tags

weight loss
metabolism
sustainable weight loss

Evidence for Assertion

Why relevant:
Why true:The study found a significant reduction in metabolism in participants who underwent calorie restriction, supporting the assertion that rapid weight loss can lead to a decrease in metabolism.
How it is true:The study provides primary evidence of the negative effects of rapid weight loss on metabolism, supporting the assertion.
ELI5
  • The study tested the effect of calorie restriction on metabolism by restricting calories in participants.
  • The participants underwent a significant reduction in calories, which led to a decrease in metabolism.
  • This decrease in metabolism was measured and found to be significant, supporting the assertion that rapid weight loss can lead to a decrease in metabolism.
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Changes of Basal Metabolic Rate in Man in Semistarvation and Refeeding
Study Type:Human Study
DOI:N/a
Experimental Study
Human
n=25
Journal of Applied Physiology
Publication 01/03/1958
Why relevant:
Why true:The study showed a clear link between rapid weight loss and decreased metabolic rate.
How it is true:The study conducted itself monitored metabolic rates and body composition metrics over a weight loss and regain phase, and found a clear decrease in metabolic rate during weight loss.
ELI5
  • The study put participants on a rapid weight loss diet.
  • During this period, they measured how many calories the body burned at rest.
  • They found that calorie burning slowed down significantly.
  • This shows that losing weight quickly can lead to a lower metabolism.
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Identification of skeletal muscle mass depletion across age and BMI groups in health and disease—there is need for a unified definition
Study Type:Human Study
DOI:N/a
Review Article
Human
International Journal of Obesity
Publication 01/09/2014

Assertion from content

The Smartest Way to Lose Belly Fat and Never, Ever Gain it Back
“There was a study that was published in the Journal of Applied physiology they found that when calories were reduced down to 1100 calories which really isn't too astronomically low there was a 17 to 20% reduction in the metabolism in 13 days”