Is it Anorexia?

If you have a problem with the way you look currently and have been ignoring your hunger and depriving yourself or meals then yeah it could be, but if your just not hungry a lot during the day, it's probably just that your body doesn't need to eat that much in a day. I'm like that too I usually only eat dinner or if I'm bored and I just don't get hungry a lot.

If someone is purposely eating small amounts because they don't like the way they look (as you said your boyfriend is), then yes, they have an eating disorder. I strongly recommend you talk to him about it and see if he would be willing to either change on his own accord or seek help in doing so. It is very unhealthy, both physically and emotionally, to deprive oneself the way it sounds like he is.

people should stop worrying about weight and start worrying about health

I do that and I'm chubby so no...unless you do it just to be thin then maybe. If you just rant hungry though your good.

I ask because my boyfriend recently told me about his eating and how he eats as little as he can during the day because he hates the way he looks.

Don't worry, I'm definitely that way, too! I eat small portions during the day because sometimes I'm really just not that hungry. Drinking water and green tea is really good for you, so even if you're not hungry, I'd advise drinking those two things.

Well, let me clear this up real quick. Eating less doesn't equal weight loss. It actually slows your metabolism and increases the rate of fat storage. Eating less sends a message to your body that it's not getting a steady supply of nutrients, and puts your body in a state of "survival mode". In that state your body is just trying to protect itself from starvation so it stores up fat just in case you have to go longer without eating. Also, anorexia is a physical condition where your muscle/body fat is so low that your bones show through your skin in such a way that you sorta look a bit like skelator. I recommend you tell the dude to o research if he wants to change his appearance.

No! but.....Anorexia is a disease,it not just not eating or getting thin,please read on,if you know of some one like this then help them speak to a Doctor.I hope this helps you know what it is.
Some people with anorexia lose weight mainly through severely restricting the amount of food they eat. They may also try to lose weight by exercising excessively. Others with anorexia binge and purge, similar to bulimia. They control calorie intake by vomiting after eating or by misusing laxatives, diuretics or enemas.
Physical signs and symptoms of anorexia include:Extreme weight loss Thin appearance Abnormal blood counts Fatigue Insomnia Dizziness or fainting A bluish discoloration of the fingers Hair that thins, breaks or falls out Soft, downy hair covering the body Absence of menstruation Constipation Dry skin Intolerance of cold Irregular heart rhythms Low blood pressure Dehydration
Emotional and behavioral characteristics associated with anorexia include:Refusal to eat Denial of hunger Afraid of gaining weight Lying about how much food has been eaten Excessive exercise Flat mood (lack of emotion) Social withdrawal Irritability Depressed mood Possible use of laxatives, diet aids or herbal products