单词 fat （胖）被视为不礼貌,因此西方忌用,
通常改用委婉的词语 put on weight
甜食 sweets,sugary foods .
他越来越胖,这是因为他喜欢吃大量的甜食
地道的说法是
He's putting on more weight because of all the sugary foods that he likes to eat.
但如果你必须用 fat ,正确的翻译是
He's getting ever fatter because of all the sugary foods that he likes to eat.
我是加拿大人.