Simple and it makes sense. I wouldn’t call it scientific proof, but as a reflux sufferer interested in non pharmaceutical solutions, I’ll give it a try.

TLDR- - Position: Kneel on something raised (like a 6.5" platform), put your head lower than your stomach by resting it on your hands on the floor

- Exercise: Eat some food (like oatmeal or a sandwich) in this position, making your esophageal muscle work against gravity

- Results: improvement after ~2 months, complete relief after ~6 months, and stayed fixed even after stopping the exercise