Most likely they will gain weight fairly quick, it depends on how many calories they burn in a day though.
The answer would be, Low self-esteem
The answer is true. if you don't have body fat your body will not function correctly and you could get diseases easily and you won't live very long. Many may not know that our body fat helps our skin and hair, maintain a normal temperature just think if we were to skinny we would be freezing to death, and our body fat helps cushion our organs and tissues.<span />
Macrominerals are needed in large amounts.
Trace minerals are needed in very small amounts.
Macrominerals are calcium, phosphorus, magnesium, sodium, potassium, chloride, and sulfur.
Trace minerals are iron, manganese, copper, iodine, zinc, cobalt, fluoride, and selenium.