DP is 6' 2" and is underweight for his height. However the weight isn't evenly distributed. He's inherited his shape from his mum, so his arms and legs (and backside!) are very thin, and viewed from behind, if you ignore the grey hair, he looks like a gangly teenager. But the front view is very different. He has a majorly significant gut.
He has an annual check up at the GP's, and they only ever focus on him being underweight. But there is so much fat around his stomach, and it's well known how much of a health risk that is.
We eat healthily, and he doesn't drink beyond maybe a glass of wine once a week. He could exercise more, he's not a gym bunny (neither am I!!) and his job is sedentary. The usual diet advice to eat less and move more just results in his arms and legs getting even skinnier, although he does lose some from round his middle.
On balance, it seems that being a bit more underweight but without the stomach is the healthier choice, but I'm out of ideas to achieve it. Does anyone have any suggestions or insight?