Eating Problems?

My brother hasn’t been eating much very within the past month or so. He eats very little at meals and I don’t see him snacking in between. He’s gotten thinner by the week and gotten close to collapsing multiple times.

I don’t think it’s anorexia, because I’ve asked him about that and he says no, he just doesn’t feel hungry anymore. I figure that’s the truth, because he’s a bad liar and I would be able to tell if he lied. He doesn’t seem to be depressed, he’s been very patient and seems genuinely happy about where he is in life.

So the real question is: Is there something wrong with him that I’m missing, like a deeper illness? And is there a way to get him to start eating more again? I know it’s an unhealthy life style he’s living…