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How do minerals help regulate fluid balance and acid-base balance?

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USDA MyPlate dietary guidelines — human nutrition MyPlate, a revised set of dietary guidelines introduced by the U.S. Department of Agriculture (USDA) in 2011, divides the four basic food groups (fruits, grains, protein, and vegetables) into sections on a plate, the size of each section representing the relative dietary proportions of each food group. The small blue circle shown at the upper right illustrates the inclusion and recommended proportion of dairy products in the diet.

In human physiology, minerals function as electrolytes—substances that dissociate into charged ions in solution—to regulate critical internal balances.12

Fluid Balance

Minerals control the movement of water between the intracellular fluid and extracellular fluid compartments. This is primarily achieved through the active transport of ions across cell membranes. For instance, energy-dependent ion pumps continuously move sodium out of cells and potassium into them. Because water follows these solutes to maintain osmotic pressure, the precise concentration gradients of these minerals ensure that cells neither shrink nor swell excessively.1234

Acid-Base Balance

Minerals also play a vital role in maintaining the body's acid-base balance, which is essential for preventing conditions like acidosis or alkalosis. Specific minerals act as buffers or components of buffer systems; for example, bicarbonate and phosphates serve as key anions that help neutralize excess hydrogen ions, thereby stabilizing the pH of bodily fluids.412