If you are pondering over, which high acid foods should be avoided, it necessarily gives food for thought, because our body system is so delicately balanced with optimum pH levels to secure normal metabolic activities that an imbalance can simply disrupt the smooth flow.
High acid foods wreak havoc starting from the digestive system increasing heart-burns, to ulcers. High-acidity can also destroy some of the useful bacteria lining the intestines.
So here is a list of high acid foods to be avoided. It is important to note that some of these foods are noted for their high-health quotient. So total abstinence from these foods is not possible, the alternate solution is to go for equivalent high-alkali foods to offset the acidity factor.

High acid foods in the fruits and vegetables category
Blackberries, Blueberries, Cherries ,Cranberries, Grapefruit, Oranges, Plums, Strawberries, Winter squash, Currants, Amaranth, Olives, Lentils

High acid foods in grains and grain-products
These include : Barley, Bran, oat, Bran, wheat, Bread, Corn, Cornstarch, Crackers, soda, wheat flour, wheat, white-Flour, Hemp Seed Flour, Kamut, Macaroni, Noodles, Oatmeal, Oats, Quinoa, Rice, Rice Cakes, Rye, Spaghetti, Spelt, Wheat,  and Wheat Germ.

High acid foods as in Plant protein and Fat (animal fat and plant oil)
These include :  Avocado Oil, Canola oil, Corn Oil, Flax oil, Hemp seed oil, Olive oil, Safflower Oil, Sesame Oil and Sunflower Oil.

High acid foods to avoid, as in animal protein and fat (animal and plant protein)
These include :  Bacon, Beef, Butter, Tuna, Turkey, Veal, Salmon, Sardines, Sausage, Scallops, Organ meats, Oyster, Pike, Pork, Rabbit, Corned beef, Fish, Lamb, Lard, Lobster, Mussels, Shellfish, Shrimp, Carp, Clams, Cod, Haddock and Venison.

High acid foods to avoid as in alcoholic drinks  beverages and miscellaneous foods
These include : Beer, Hard liquor, Spirits, Wine, Catsup, Coffee, Mustard, Pepper and Soft Drinks

High acid foods as in food additives
These include : Vinegar, Carob, Corn syrup and Sugar.

The above enumeration on the high acid foods to avoid throws light on the high acidity factor. As most of these are highly nutritive with some rooted in medicinal properties, they form an integral part of our daily diet. So derive the maximum health benefits of all foods by making the right combination in your diet, so that what is nutritious is not ‘acidified’ by a negative health impact.

Photo Courtesy :  livestrong.com