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Food Acidity ranges
| Acidity | Description |
| 0 to 3.6 | Very acid - very bad for heartburn |
| 3.6 to 4.5 | Mildly acid - may or may not cause heartburn |
| 4.5 or higher | Not acid - most probably won't cause heartburn |
For more details search on food acidity and alkalinity look at the list below. Items with higher values are the safest for your stomach. For more details on specific food items and whether they cause heartburn or not take a look at Food Database
Click to Browse an Entire Food Acidity List
| Item |
Approximate pH |
| Oatmeal, cooked | 6.20 - 6.60 | | Octopus | 6.00 - 6.50 | | Okra, cooked | 5.50 - 6.60 | | Olives, black | 6.00 - 7.00 | | Olives, green, fermented | 3.60 - 4.60 | | Olives, ripe | 6.00 - .50 | | Onions, pickled | 3.70 - 4.60 | | Onions, red | 5.30 - 5.80 | | Onion white | 5.37 - 5.85 | | Onions, yellow | 5.32 - 5.60 | | Oranges, Florida | 3.69 - 4.34 | | Oranges, Florida "color added" | 3.60 - 3.90 | | Orange Juice, California | 3.30 - 4.19 | | Orange, Juice Florida | 3.30 - 4.15 | | Orange, Marmalade | 3.00 - 3.33 | | Oysters | 5.68 - 6.17 | | Oyster, smoked | 6 | | Oyster mushrooms | 5.00 - 6.00 |
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