Don't know if I should I be concerned with DS14 eating?

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DS has always been very tall for his age and although not overweight, a big build. A few months ago whilst topping up his lunch money at school I realised he was having very little to eat eg. a sandwich and nothing else. He also has not been eating much for breakfast eg. one piece of toast. He always eats all his evening meal - wolfs it down as he is no doubt starving, then will usually have fruit, sometimes a yogurt but usually declines 'fattening' puddings which he previously loved. He is imo not really eating enough to maintain his weight being over 6 ft. If we eat out he gets, for example, a small pizza instead of a large one he would have had previously.

I have told him to get more for lunch at school, but am worried that if I make a big deal about it I could be making it into an issue. I am also worried that if I don't it could get worse. He has also started weight training. So am I being unreasonable to be keeping my worry to myself?

It sounds like he'd like to be slimmer and is taking steps to get healthier. Obviously keep an eye out but it sounds fine to me. Well done to him!

If he has started weights is he trying to eat healthier? You could encourage him to look at sites on nutrition and weights.

See if you can get him in to eating more but healthier options, like good fats, good proteins etc if he doesn't want junk. It's not a bad thing he is being sensible about his food. Also no one should be eating a large pizza to themselves. No one.

He's just eating normally and good portion sizes 🤷 he'll eat more if he's hungry generally. Intuitive eating is fine and the proper way to eat.

Can you encourage him to take a packed lunch then he can select healthy options to take with him? School dinners aren’t normally the best for healthy eating

If he has started weight training I assume it is with the aim to build muscle. Might be worth casually bringing up in conversation with him that his nutrition needs to be spot on for his muscles to grow ie needs to be eating in a surplus!

If he's weight training he'll need lots of fruit and veg and lean protein, nothing wrong with that and I agree with PPs no one needs to eat a whole large pizza on their own

You would be wise to keep an eye on this, a teenager needs a lot of calories to grow into adulthood, at his age around 2600 maybe more depending on activity level.

Please keep an eye on his intake but also his mood, he needs fats in his diet as well as all the other nutrients.

My daughter started her descent into Anorexia with ‘healthy eating’ so I guess im always on high alert, happy to talk by pm if you are concerned.

Hmm not sure, I have 2 lads (18 and 17) both over 6 feet and both quite sporty (think rowing 10miles at a time) and healthy but look relatively skinny. They have both gone through periods of not eating much at all but then weeks and weeks of being ravenous.
Neither have eaten breakfast since primary school. Does he snack?
What does he drink? milk is quite calorific as are smoothies. Would he add protein powder to drinks?

He really only snacks on fruit these days and won't drink milk (but was never that keen). Every now and then he does eat loads - like a massive lunch but will then revert back to 'watching what he eats' thev rest of the day. I really can't decide whether I need to be concerned or not. He seems to be his normal self in the rest of his life. He won't take packed lunch to school as all his friends buy lunch and he wants to sit with them. i have discussed the need for good nutrition for weight training - eating protein etc.. Might discuss healthy snacks and get him to choose some when I do the next shop.