English's idioms help?

Question

can anyone comes out with some idioms or good sentences that related to child obesity?(for a column writing)

Answer 1

You are what you eat?

Blind leading the blind? (referring to parents who make equally poor eating choices)

Answer 2

Jack Sprat could eat no fat and his wife could eat no lean. . .

See d**k lumber (?)

Those chubby lkegs look like the Michelin Man

If you don't use it, you don't lose it!