Mahathir, Matthias and Cake?

I read that Mahathir successfully convinced Matthias Chang to end his hunger strike. Well, no one wants to see Matthias cause serious and irreversible damage to his body and I am sure most are glad to know he is eating solids now. I wonder what the old man said to the not so old man? Could it have been:

"Matthias old chap! Stop trying to have your cake and eat it!"