haven't eaten anything since …
昨日から何も食べてない。
I haven’t eaten anything since yesterday.
昨日から何も食べてないんだ。
I haven't eaten anything since yesterday.
朝から何も食べてないんだ。
I haven't eaten anything since this morning.
実は、今朝から何も食べてないのです。
Actually, I haven't eaten anything since this morning.