<human>: My husband (together about 10 years) is about 5'10" and his weight has always been between 170 and 195. He decided in the last month that he really wants to get in better shape, and at first I was all for it! He started to count calories and work out for 30-40 minutes every day.

But things very quickly got, in my opinion, out of hand. He decided that to lose weight faster, he would just eat the minimum possible number of calories every day. He eats nothing except for maybe some celery, carrots, or grapefruit until dinner, when he allows himself to have one full meal of whatever we decide to cook that night.

I've tried to tell him that I think this is (a) unhealthy and (b) unsustainable and he just keeps insisting that it's working well and when he gets to his goal weight he'll stop. 

Should I just let this go and let him do what he wants? Or is there another way I should approach this with him to show him that this is not a good way to lose weight?

Summarize the given text in a few sentences.
<bot>: Husband is trying to lose weight by starving himself until dinner every night. I don't think this is a good idea but he swears it's working therefore it's okay.