That would go along with ds.
Apparently celiac kids gain all their weight back first and then go through bone growth. My ds had bone growth first after going gf (the first year growing twice what is expected for his age group), and although he is almost on the charts again for height, his weight never did pick up the way we were looking for. Can't get him to gain weight no matter what we feed him.
Even on SCD, where they warn not to eat too many nut products so that you don't gain weight... he didn't gain weight (beyond the bit that he always seems to gain even when he puts himself on frequent fasts).
Illness-wise: He also has not been 'sick' or sick enough to miss anything for the last 3 years (almost 4
). Going SCD to clean him up and then relaxing into gf and other things free really got rid of the 'sickness' thing. (knock on wood).