Being underweight in a third world country usually means being poorly nourished and/or infected with parasites. In developed countries, the underweight person is more likely to have a higher metabolism, fewer fat cells, "lean genes" or just not care about food.
Stress causes some to overeat and gain weight and others to lose appetite and weight. Weight loss can also be due to wasting diseases such as cancer and AIDS. Hyperthyroidism, eating disorders and excessive physical activity must also be considered.
A major psychological cause of being underweight is depression. Depressed individuals often have reduced appetite and rapid weight loss.
Eating is the first and most important factor that is needed for proper weight gain – put simply, you need to eat more calories than you burn. Taking meals and snacks more frequently will help accomplish this. Eat every 2.5 to 3 hours; focus on foods higher in protein along with fruit, vegetables and assorted types of nuts. What you eat is the most important ingredient in a successful weight gain program.
Coconut oil consumption may encourage weight gain if you are underweight, but it can also encourage weight loss in obesity, possibly due to an increase in metabolic rate.
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