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I found this sentence in Nihongo Sō-Matome:
A: また太っちゃった。。
B: あまいものばかり食べているからだよ。
Based on my understanding:
A: (you're) fat again...
B: I only eat nothing but sweets.
I do not know why からだよ is there.
Should the translation be: body eats nothing but sweets? Is it ok to remove からだ?
First off, I think you got the actors the wrong way round.
A また太っちゃった。
I ended up getting fat again.
B あまいものばかり食べているからだよ。
That's because you eat nothing but sweets.
Can you remove からだ? Grammatically you can, but it wouldn't sound natural in the same way that this English exchange would sound slightly awkward:
A) I ended up getting fat again.
B) You eat nothing but sweets.
B's reply doesn't feel like part of the conversation does it? It just sounds like a random statement of fact.
Edit: I've just realised your problem. You thought からだ was 体 meaning body. But it isn't. It is から meaning 'because' plus the copula だ.
