Weight and Health: Beyond Diets

Introduction

Overweight and obesity affect 47% of adults in France, nearly 24 million people. Yet the diet industry generates billions each year promising rarely lasting results. The Mann et al. (2007, American Psychologist) meta-analysis demonstrated that restrictive diets fail in 95% of cases long-term, with weight regain — often exceeding initial weight — within 2-5 years.

This reality demands a paradigm shift: moving from a weight-focused approach to one centered on overall health, well-being and one's relationship with food.

Determinants of Body Weight

Genetic Factors

Genetics explain 40-70% of body weight variability between individuals (twin studies). Over 700 genes have been identified as influencing weight, including FTO, MC4R and LEP. However, genetics don't determine destiny — they establish a predisposition modulated by environment and lifestyle.

Hormonal Factors

• Leptin: "satiety hormone" from adipose tissue, signaling energy reserves to the brain. Leptin resistance can develop in obesity.
• Ghrelin: "hunger hormone" from the stomach. Restrictive diets increase ghrelin, intensifying hunger.
• Insulin: key glucose metabolism hormone. Insulin resistance promotes fat storage, especially abdominal.
• Cortisol: "stress hormone." Chronic stress elevates cortisol, promoting abdominal storage and compulsive eating.
• Thyroid hormones: regulate basal metabolism. Hypothyroidism can contribute to moderate weight gain.

The Set Point Theory

Each organism tends to maintain weight within a biologically determined range. When weight deviates, compensation mechanisms — increased appetite, decreased basal metabolism — return it to equilibrium. This explains the yo-yo effect of diets.

Psychological Factors

• Emotional eating: eating in response to emotions rather than physiological hunger.
• Cognitive restraint: permanent mental food control that depletes cognitive resources.
• Body image and self-esteem: body dissatisfaction can maintain a diet-frustration-compulsion cycle.

Why Diets Fail

• Decreased basal metabolism: the body conserves energy. The Fothergill et al. (2016) study on "The Biggest Loser" participants showed their metabolism remained significantly slowed 6 years later.
• Increased ghrelin: hunger intensifies after dieting.
• Decreased leptin: the satiety signal weakens.
• Muscle mass loss: hypocaloric diets cause lean mass loss (up to 25% of weight lost).
• Psychological effect: deprivation generates frustration, food obsession and eating disorder risk.

Metabolic Health: A Health-Centered Approach

The "Health at Every Size" (HAES) paradigm proposes focusing on objective health markers rather than weight: fasting glucose, lipid profile, blood pressure, waist circumference, physical activity level, sleep quality, psychological well-being.

Integrative Approaches to Weight Balance

• Intuitive eating: restoring connection to hunger and satiety signals.
• Mindful eating: eating with awareness, savoring, recognizing internal signals.
• Enjoyable physical activity: movement chosen for pleasure, not punishment.
• Stress and emotion management: sophrology, hypnosis, meditation.
• Naturopathic support: microbiome, liver detoxification, hormonal balance.

Disclaimer

This article is provided for informational and educational purposes only. It does not replace professional medical or nutritional advice. Any dietary or lifestyle changes should be guided by a qualified professional. Eating disorders require specialized support.