How does fasting help in attaining higher states of consciousness?

I heard if you starve yourself long enough . You’ll see God

As a nutritional expert, this is mostly a myth. With that being said, if you stop eating, something most people do normally do everyday, your body (and your mind) is going to shift to accommodate the change. That "shift" makes it seem like you are literally on another dimension. The human body though is "set-up" to process food each day on a cycle.

Uhh... I have no idea who the hell is teaching you that you aren't meant to eat every day, but that person(s) is dead wrong. We need food to survive. Animals of all kinds eat every day, except sloths. Most of them eat multiple times a day. Just because we're human doesn't mean that our eating needs are different from our primal ancestors.

I personally think fasting per se is not really all big of a deal and it is more about giving your body a break from the processed food crap we shovel down on a daily basis that can make you feel better with a very rudimentary diet.

Clears the sugar out of the brain. There are some doctors who believe that sugar intake is linked to dementia.

I fasted for 25 days once. Been so long but I think ketosis? sets in or something used to fast here and there when younger..

It doesn't.

I have no idea regarding states of consciousness, but intermittent fasting can be really healthy for you.