which foods are highest in carbs

The evidence for high-carbohydrate foods worsening GERD is direct but comes from a single tiny study.

A 2018 crossover study of 12 GERD patients compared a high-carbohydrate liquid meal (178.8 g carbs) to a low-carbohydrate meal (84.8 g carbs), matched for protein and fat [3]. The high-carb meal more than doubled esophageal acid exposure: the Johnson-DeMeester score rose from 14.3 to 39.7, total reflux time went from 8.8% to 21.8%, and the number of reflux episodes nearly doubled [3]. Symptom scores were also higher across all GERD grades [3]. This is the only direct test of carbohydrate density on reflux in the retrieved evidence.

But the study has major limits. It used liquid test meals, not real food. It had only 12 patients. It measured acute effects over hours, not long-term outcomes. It did not track Schatzki ring recurrence or any structural endpoint [3]. The high-carb meal had 178.8 g of carbohydrate — roughly the amount in two large bowls of pasta or three cans of soda — which is a very high single dose.

Outside this study, the retrieved evidence does not rank specific high-carb foods by their effect on reflux or rings. The 2021 low-FODMAP trial in 31 patients with refractory GERD found no superiority over usual dietary advice for symptom reduction [2]. The 2018 Nagahama study of 9,364 people found that higher miso soup intake was associated with lower GERD symptom scores, but that is a fermented soy product, not a high-carb food [1].

My call: High-carbohydrate meals — especially in large single doses — acutely worsen acid reflux in people with GERD, but no study has tested whether reducing carbohydrate intake prevents Schatzki ring recurrence. Confidence: low for ring prevention, moderate for acute reflux worsening.