High metabolism in some individuals can make weight gain difficult, even with a high calorie intake.
Some individuals have a naturally lean body type, characterised by reduced body fat and increased muscle mass.
Physically active persons may burn more calories than they consume, making weight growth harder.
Stress and a lack of sleep can raise cortisol levels and lower growth hormone levels, limiting muscular building and making weight gain harder.
Genetic illnesses like hyperthyroidism, cystic fibrosis, and celiac disease can lead to weight loss, and nutrition absorption issues.
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