Unit 233
(I think Peter is hungry.)
Eat some more.
No. thanks, I'm on diet.

Eat some more. Have some more.　
Thank you very much, I need it. Give me lot and lot.
To be on diet=to go on diet.
I'm putting on a lot of weight, so I need to go on diet.
(Put on your clothes. Put on your hat. Put on your shoes. )
I'm losing a lot of weight.