pH值越低，酸性越高；无糖苏打饮料（pH2.9-3.7）、草莓（pH3.5）以及烧烤调味酱（pH3.7）等食物饮料均属高酸食品。

The lower the pH, the higher the acidity; highly acidic foods and beverages include diet sodas (2.9 to 3.7), strawberries (3.5) and barbecue sauce (3.7).

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研究发现，与导致低抑郁关系最密切的饮食因素是水果，坚果，豆类，以及含更多非饱和脂肪酸的脂类食品。

The elements of the diet most closely linked to a lower risk of depression were fruits and nuts, legumes and a high ratio of monounsaturated to saturated fats, the study found.

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富马酸及其衍生物具有无毒、低腐蚀性等特点，广泛用于食品、医药、化工、涂料、树脂、增塑剂等领域。

Fumaric acid and its derivatives are chemical of no poison and low corrosiveness, Which have a widely use in the field of food, medicine, chemical engineering, paint, resin and plasticizer, etc.

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