そんなに食べてはいけません。太りますよ。

Don't eat so much. You'll get fat.

そんなに食(た)べてはいけません。太(ふと)りますよ。

Sonnani tabete waikemasen. futorimasu yo.

そんなに (そんなに)

so much; so; like that

食べる (たべる)

to eat; to live on (e.g. a salary); to live off; to subsist on

ば (ば)

if ... then; when; and; why don't you...?; the more (one does something); because; since

太る (ふとる)

to grow fat (stout, plump); to become fat; to gain weight

よ (よ)

indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!

Readings: ショク、ジキ、く.う、く.らう、た.べる、は.む

Meanings: eat, food

Readings: タイ、タ、ふと.い、ふと.る

Meanings: plump, thick, big around