Coffee (with or without caffeine) and caffeinated beverages relax the lower esophageal sphincter.
Citrus fruits and juices such as orange, grapefruit and pineapple have high acid content.
Tomatoes and processed tomato-based products such as tomato juice, and pasta and pizza sauces are highly acidic.
Carbonated beverages (fizzy drinks) cause gaseous distension of the stomach (bloating), which increases pressure on the lower esophageal sphincter causing acid reflux.
Chocolate contains a chemical called methylxanthine from the cocoa tree, which is similar to caffeine. It relaxes the lower esophageal sphincter, which causes acid reflux.
Peppermint, garlic and onions relax the lower esophageal sphincter causing acid reflux.
Fatty, spicy or fried foods relax the lower esophageal sphincter as well as delay stomach emptying and therefore cause acid reflux