

That’s a Flemish Giant (breed).
Historically they are a utility breed used for their fur and meat. In the modern day, they are no longer commonly raised for meat, due to their slow growth and very large bones, and are raised for exhibition at rabbit shows. They are often kept as pets as they are known for being docile and patient when being handled.
It’s like dogs. Different breeds. Some dogs have had their hunting instincts bred out of them.
If you’re looking for a serious answer, not at all. Snacking all day is the opposite of fasting. Just because it’s small doesn’t mean it’s not food.
If he actually didn’t eat all day and then had a huge meal at night, that would be it. That would also be called OMAD (one meal a day), which is a type of intermittent fasting.