Because the magnitude of the effects isn't the same. The evidence is very clear - obesity _causes_ several negative health conditions. To suggest that crash die

Because the magnitude of the effects isn't the same. The evidence is very clear - obesity _causes_ several negative health conditions. To suggest that crash dieting somehow reduces the relevance of those conditions is to deliberately mislead. Some links: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC380258/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC380258/ https://pubmed.ncbi.nlm.nih.gov/33882682/ https://pubmed.ncbi.nlm.nih.gov/33882682/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5038894/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5038894/ I would love to see any research you're aware of that would show evidence that crash diets cause significant health issues (I don't doubt that there are some diets that cause weight loss while being bad for health in other ways) but to suggest that the side effects of those diets compare in magnitude to the side effects of obesity itself is extremely misleading. If you have any reputable sources that provide evidence to the contrary I would be happy to read them, but I think you're misleading people, deliberately or inadvertently.