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Experts Say: Crash Diets Can Wreck Your Body—and Your Mind

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Many people today are turning to drastic meal routines, such as eating once a day or even skipping meals entirely, to achieve quick weight loss or longevity.

However, while these approaches may lead to rapid results on the scale, health experts are sounding the alarm about their long-term dangers.

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Moderation has long been recognized as a cornerstone of healthy eating. It supports proper digestion and metabolism and reduces the risk of chronic diseases linked to overeating and high-calorie diets. But extreme dieting goes far beyond moderation, often cutting calories and nutrients to levels that can harm the body’s basic functions.

One primary concern is metabolic slowdown. When calorie intake drops too low, the body shifts into survival mode, reducing energy expenditure. This stalls weight loss and can lead to rapid weight gain once normal eating resumes—commonly known as the yo-yo effect.

Another issue is muscle loss. Rapid weight loss from extreme dieting often involves the breakdown of muscle tissue, which can increase body fat percentage even if overall weight decreases. This is particularly concerning for individuals in their 30s or older, when natural muscle loss already accelerates.

Hormonal imbalance is another serious consequence. Severe calorie restriction can raise cortisol levels, the stress hormone associated with sleep disruption, weakened immunity, and mood swings.

In women, low energy intake can disrupt estrogen production, leading to irregular or missed periods. Men may experience decreased testosterone, which can affect strength and libido.

Brain function can also suffer. When carbohydrate intake is too low, the brain lacks its primary energy source: glucose. This can lead to brain fog, poor concentration, and a higher risk of anxiety and depression.

Gut health also suffers. Extreme diets often lack fiber and prebiotics, key components that nourish beneficial gut bacteria. Poor gut health affects digestion and can weaken the immune system, as over 70% of immune cells reside in the gut.

Perhaps most alarming, extreme dieting can pave the way for eating disorders.

A well-intentioned plan to lose weight can spiral into an unhealthy obsession with food, resulting in conditions like anorexia or binge eating disorder. This risk is particularly high for teenagers and young women who may be more vulnerable to social pressures around body image.

Experts agree that balance is essential. Even for those aiming to lose weight, a healthy diet must include a variety of nutrients—protein, healthy fats, complex carbohydrates, vitamins, and minerals. Instead of skipping meals, focus on improving their quality: choose whole grains over refined ones, include enough protein, and fill your plate with vegetables.

If your goal is lasting health, not just a quick fix, ditch the extreme diets and adopt sustainable habits. Your body is resilient and thrives when appropriately fueled with nutritious food, adequate rest, and regular exercise. Slow and steady in the journey toward better health truly wins the race.

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