此处所说的“酸”,并非是化学上的酸性物质,而是指人体所摄取的营养物质酸碱度的“酸性”而言的。我们知道,人体蛋白质的理化性状、酶的活性以及重要的生理生化过程,都与机体内环境的酸碱度即pH值密切相关。稳定的pH值是维持机体各项正常生理功能的重要条件之一。正常情况下,人体的各种体液都相对稳 As used herein, “acid” is not a chemical acid but refers to the “acidity” of the pH of the nutrient taken by the human body. We know that the physical and chemical properties of human proteins, enzyme activity and the important physiological and biochemical processes, are closely related to the pH value of the body environment pH. Stable pH is one of the important conditions to maintain the normal physiological function of the body. Under normal circumstances, the body’s various body fluids are relatively stable