easy child is 5'10" and weighs 130 pounds. I calculated his BMI for his age on the CDC website and it's 18.7 which they say is a healthy weight - under 18.5 is underweight, so he's right on the cusp. I tell him all the time he needs to eat. Right now, he eats about one meal a day - lunch. He used a scale at my parents that told him that he is 8.4% body fat. He thought that was pretty cool. What he does eat isn't healthy. No vegetables - unless you count french fries . No fruits - very rarely he'll eat some grapes. He has vitamins - he doesn't take them. Today he bent down to feed the dog and stood up and everything got black and his head hurt. Told him that was his blood pressure dropping and that it happened to me all the time when I was underweight. Told him he needs to eat. I tell him every day. He is tired all the time. He slept 15 hours last night. When he gets sick - a cold, for example - he is really sick for 3 weeks. Wynter got the same cold and it was only bad for about 2 days. He works until 9pm tonight. I gave him some money to get something to eat and told him to get something at least resembling healthy - to go to the deli and get a ham and cheese sandwich. Told him he needs to eat breakfast every morning, even if it's just toast. His girlfriend is also always telling him that he needs to eat. I don't know what to do. I'm really worried. He's just getting thinner and thinner. He's cold so easy now. It used to be if it hit 65 he was sweating. What do I do?