Due to high metabolism, it leads to rapid calorie burning, even with a large calorie intake.
Genes also influence body calorie storage and utilization which let you hardly gain weight.
Consuming junk or processed meals may not give enough nutrients for weight gain, which may have an impact on your general health.
Medical conditions like hyperthyroidism or celiac disease can hinder the body's nutrient absorption, leading to difficulty in weight gain.
Despite eating a lot of food, you burn more calories than ingest, if you are doing high-intensity activities like running, swimming, or sports.
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