Hi, Thanks for using HCM.
Possible conditions for your increase in weight:
. Look for TSH level
intake or endogenous increase in steroid secretion(Cushings)
If you dont have any other symptoms then look for these conditions.
At adulthood there will be change in weight due to fusion of epiphysis
. But since your intake is restricted and heavy work, I advice you to consult your board certified doctor for examination once to look for if any problem.
Hope I answered your question. Consult your doctor for further examination and management. Feel free to ask me if you have any further queries.
Wish you good health. Take care.