1921, Dean Alfred Vivian, “The fruit crop in its relation to the national diet”, in Proceedings of the 54th Annual Meeting of the Ohio State Horticultural Society[1], Columbus, Ohio: The F.J. Heer Printing Co., page 42:
You know of course that when we eat food it is burned in the body just as surely as if it were put into a furnace and burned, and that there is left behind in the body the ashes of the food just as the ashes of coal and wood are left in the furnace. […] If we were to live on bread and meat alone, for instance, two substances which have an acid ash, we would soon bring about the condition which doctors call acidosis, which would be dangerous to our health, and we must have in the diet something to overcome that acid condition.
2004, M. Ted Morter, Health and Wellness, Pustak Mahal, →ISBN, page 108:
The body is able to handle acidifying minerals in moderate quantities. However, if most of your food leaves acid ash, too much acid accumulates and the vital minerals of your alkaline reserve must be used to neutralize the acid.
2013, Sareen S. Gropper, Jack L. Smith, Advanced Nutrition and Human Metabolism, 6th edition, Cengage Learning, →ISBN, page 452, column 1:
Acid ash is produced in the body in varying amounts based upon the foods consumed; ingesting meat, fish, eggs, and cheese (and to a lesser extent, most grain products) generates more acid ash in the body than ingestion of other food groups.
2019, “Appendices”, in Haewook Han, Walter P. Mutter, Samer Nasser, editors, Nutritional and Medical Management of Kidney Stones, Springer, →ISBN, page 344:
Animal protein contains “purine” the precursor of uric acid and is metabolized in the body and produces acid ash. This can make the urine more acidic which favors uric acid stone formation.
(Adjective) Tending to produce acid ash when consumed
1991, Marine E. Vlok, Manual of Nursing, revised ninth edition, volume 1, Juta and Company, →ISBN, page 309:
Food is prepared and served without salt; acid ash foods are balanced with alkaline ash foods; plenty of fluids are given —3 600 to 4 800 ml per day; acid medicines are sometimes prescribed with the diet, viz. HCl.
1992, C. B. Cataldo, L. K. DeBruyne, E. N. Whitney, Nutrition and Diet Therapy: Principles and Practice, West Publishing Company, →ISBN:
An acid ash diet, intended to make the urine more acid than usual, centers on meat, cheese, eggs, whole grains, and some fruits.
2019, Anne-Marie Desai, “Nutritional Management of Uric Acid Stones”, in Haewook Han, Walter P. Mutter, Samer Nasser, editors, Nutritional and Medical Management of Kidney Stones, Springer, →ISBN, page 128:
Historically a diet rich in fruit and vegetables was referred to as an alkaline ash diet, and a diet rich in animal proteins was referred to as an acid ash diet.
2020 November 30, Improving Road Pavement Characteristics (Innovation and Discovery in Russian Science and Engineering), Springer Nature, →ISBN, page 64:
In the ternary diagram compiled in [167] for the chemical composition of the ash from burning solid fuel of various deposits, the ash of Novocherkasskaya TPP falls into the region of acid ash (Fig. 4.11).
