Hi Pilo,
its totally normal! when i was having chemo it was a combination of:
steroids,
taste disturbance (so only sweet foods and carbs tasted right),
nausea like a hangover so i wanted to carb-load
craving energy food due to the fatigue
comfort eating
and boredom
i'm sad to say that i gained 24lbs. thankfully it isnt too difficult to lose afterwards with gentle exercise (walking, swimming, yoga) and eating healthier (easier when you feel well). I finished active treatment in may and I've only got 9lbs left to lose - so my best advice is to do whatever helps you get through treatment and worry about weight afterwards. good luck xxx