If you already follow a diet, especially for the first time, you will likely see result whether this diet is keto, paleo, mediteranean or anything really. i think the positive effect i got when i did keto a few years back were in hindsight 90% taking care of myself, paying attention to what goes in my stomach and some contextual effects (placebo), despite what i said at the time. The allergies reduction might've been keto though.