I was a former D1 full scholarship college athlete. After graduating I just didn't have any drive to workout, mostly because all my drive to exercise was centered around the competitive aspect of it- I was always looking towards the next race, qualifying time, etc. Without that, I just can't find the motivation to stick to any exercise routine. As a result, I've become.... irregular around the margins.
I started intermittent fasting out of time management necessity. Basically, one giant meal around 10 am and then a small one before bed. I lost a serious amount of weight considering I was doing no exercise. People will say it is unhealthy, but the notion of 'lots of small frequent meals is good for your metabolism' is one of those unfounded, largely accepted nutritional models. We didn't evolve to consume energy in that manner. The 3 meals/ day is entirely a social construct, not a biological one.
Basically.. I intermittently fast out of necessity but have been performing as well/better because of it. I find my focus goes up towards the end of my fast.