DS13 is 5ft 10 and has always been very tall, and quite heavy (but not fat - just solid).
This last 6 months though, i've noticed that he is eating much less, even though he's put on about 2 inches in height. Now the trousers that he got last december are far too big in the waist.
He has even cut down on his fvaourite foods, like pizza.
Now his friends joke about how thin he has become and puzzle over the triangle shape he makes with a small waist but broad shoulders.
Should I be concerned, or grateful that he seems to have learned to control his appetite? (he loves food)