Sharing my personal single data point experience, in the hope it helps others. I started low carb then keto about 5 months ago when my migraines turned chronic (a few times a week). I haven't had a migraine in the past 3.5 months. Also lost weight and generally feel great.

I was following the advice in this book: https://www.amazon.com/Migraine-Miracle-Sugar-Free-Gluten-Fr...