Considering how much I ate, I didn't gain any weight.
Even though I ate quite a bit, I didn't put on any pounds.
この場合、次のような言い方ができますよ。
ーConsidering how much I ate, I didn't gain any weight.
「食べた割には太らなかった」
considering ... を使って「割には」を表現できます。
ーEven though I ate quite a bit, I didn't put on any pounds.
「すごくたくさん食べたのに、全然太らなかった」
このような言い方もできます。
ご参考まで!