Your body may be too used to your schedule if you’re eating around the same time each day (i.e. dinner every night) which means your metabolism has slowed down.
Listen to this episode of The Fasting Method podcast, around 9 minutes in. They talk about how OMAD is great until it stops working- then you have to switch up your fasting protocol to sort of “shock” your system.
I am only a week into OMAD and it’s working well for me, but I have 30/16 in my back pocket once it no longer produces the results I am looking for.