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Longevity doctor warns against hidden risks of rapid weight loss: ‘Becoming lighter but weaker’

Weight loss is a fitness goal for many, but achieving it too fast comes with significant risks, explains Dr Vass. 

Updated on: May 27, 2026, 19:17:05 IST
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Weight loss is the fitness goal for many across the globe. However, achieving it rapidly might not be the healthy option, according to Dr Vassily Eliopoulos, a longevity expert trained at Cornell University and co-founder and chief medical officer of Longevity Health.

Rapid weight loss comes with many associated risks. (Pexel)
Rapid weight loss comes with many associated risks. (Pexel)

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Taking to Instagram on May 26, Dr Vass shared what actually happens to the body when one starts to rapidly lose weight, and what can be done about it.

The weight loss paradox

Describing the likely negative effects of rapid weight loss, Dr Vass introduced the weight loss paradox. He went on to describe it as follows.

Rapid weight loss feels like success. The scale goes down. Clothes fit better. You feel lighter. But here's what's happening inside:

You're losing weight. But you're also losing muscle, bone density, strength, and metabolic capacity.

You're becoming lighter but weaker. Smaller but more fragile.

Ill effects of rapid weight loss

Losing weight at an accelerated rate significantly increases the risk of the following health conditions.

1. Sarcopenia: Rapid weight loss triggers muscle loss, especially without adequate protein and resistance training. One loses lean mass faster than fat mass.

2. Bone density loss: Weight loss reduces mechanical load on bones. Combined with nutrient gaps, bone density declines and fracture risk increases.

3. Metabolic slowdown: Muscle is metabolically active. Losing muscle slows the resting metabolic rate of a person. Future weight loss becomes harder, while it becomes easier to regain weight.

4. Nutrient deficiencies: Eating less means consuming fewer micronutrients. Deficiencies in iron, B12, vitamin D, magnesium, and zinc accelerate ageing and dysfunction.

As a result, the person becomes frail overall. The apparent results of losing weight very fast include:

  • Weakness: Reduced strength and muscle mass. Difficulty with daily tasks. Increased fall risk.
  • Fatigue: Nutrient deficiencies and muscle loss reduce energy and recovery capacity.
  • Fragility: Lower bone density, reduced muscle protection, increased injury risk.
  • Compromised metabolism: Slower metabolism, reduced insulin sensitivity, increased disease risk.

How to stay strong while losing weight

When one attempts to lose weight to get healthier, the goal is not to shrink, noted Dr Vass, “The goal is to become metabolically stronger while losing weight.” This can be ensured through the following:

1. Adequate protein: 1.2-1.6g per kg body weight to preserve muscle mass.

2. Resistance training: Three to four times weekly to maintain and build strength during weight loss.

3. Micronutrient optimisation: Supplementation to prevent deficiencies during caloric deficit.

4. Metabolic monitoring: Regular biomarker testing to track muscle mass, bone density, metabolic rate, and nutrient status.

5. Supervised protocol: Medical oversight to ensure weight loss is healthy, sustainable, and protective of function.

Note to readers: This article is for informational purposes only and not a substitute for professional medical advice. Always seek the advice of your doctor with any questions about a medical condition.

This report is based on user-generated content from social media. HT.com has not independently verified the claims and does not endorse them.

  • Debapriya Bhattacharya
    ABOUT THE AUTHOR
    Debapriya Bhattacharya

    Debapriya Bhattacharya is a Content Producer at Hindustan Times. He started his career in 2022, working in newsrooms in beats like education, US news, trending stories, and entertainment. In his new role in the lifestyle desk, he seeks to deliver a balanced blend of research-driven reporting and creative storytelling from health and recipes to art and culture. Science, philosophy, food and pop culture are what pump his veins and help bring heart to his stories. Debapriya tries to see out subjects that will allow him and readers to explore new frontiers and improve the quality of life for all. The explorations can be both external and internal, as thoughts seek to be as chaotic as the greater universe. As a citizen of the world, Debapriya has been fascinated by the lives of people across the globe throughout time. His curiosity leads him to explore new linguistic and cultural landscapes to broaden his horizons and deepen his understanding of global narratives. Beyond the newsroom, Debapriya loves to participate in debate and theatre, spaces that he considers to be holy grounds for nuance and self-expression. A graduate from Ashutosh College, University of Calcutta, Debapriya completed his Master's degree from the same university in 2022. An ambiverted bibliophile, he loves his solitude as much as he adores stimulating conversations. And despite his reverence for tech, libraries continue to be his favourite place for research.Read More

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