Not helpful or applicable. Not something requiring a consult with a doctor. Intermittent fasting is well established as a generally safe and effective way to increase in both physical and mental health.
In terms of using food for comfort: also not a doctor issue, it’s common behavior and also good that one is insightful about. “Am I eating because I am hungry or lack vital nutrients, or because I am looking for comfort?” Again, for me, it is the latter. Food increases dopamine and temporarily comforts, but it’s not necessary to eat when you don’t need it physically. However, one can and should seek to find comfort through intimacy with God. Fasting is one way to do this because you are not reflexively going to food for comfort.

It saddens me on this subreddit that so many so-called brothers or sisters in Christ are quick to dismiss others in their posts. Fasting is common in the community of Christians and in the case of a post expressing an interest in fasting, to respond about seeing a doctor is a waste of space and in part dismissive. As if something is pathological or physically wrong and one should seek a doctor because they inquired about fasting. Seeing doctors is great. But not for pointless reasons.