Rice

Food · Grains & Legumes · Grains

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food source · 1

Magnesium
The magnesium in rice sits in the bran layer. Brown rice has about 3.5 times as much magnesium as white rice, because polishing grinds that layer away and the magnesium with it.
Mechanism · 2
Mechanism · The nutrients live in the bran
The bran and germ of a rice grain are its store of nutrients: magnesium, B vitamins, phosphorus and manganese sit in that layer, and the starchy center has almost none. Polishing grinds off the outer layer and carries away these parts the body needs to make energy. So white rice is not simply empty; it is rice without that layer.
In practice · With white rice, find magnesium elsewhere
Brown rice has about 3.5 times as much magnesium as white rice, so the source here is brown rice, not white; people whose staple is white rice need vegetables, beans and nuts for their magnesium. The bran of brown rice also carries phytate, which locks up part of the minerals, so a higher content does not mean proportionally more gets absorbed; soaking removes some of the phytate.

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What rice is · what milling changes

EVIDENCEGUIDE 1

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White rice and brown rice are the same grain. Milling grinds off the outer bran and germ, and the fiber, magnesium, and B vitamins go with them, leaving almost pure starch. How fast a bowl of rice raises blood sugar also depends on the structure of its starch, how much you eat, and whether it was cooled; a later chapter, on what sets how fast rice raises blood sugar, takes that apart.

A grain of rice has three layers, from outside in. The outermost husk is a hard shell that comes off for both white and brown rice. The middle ring, the bran and germ, is the grain's nutrient store: fiber, fat, magnesium, B vitamins, and plant polyphenols all sit there. The innermost endosperm is almost all starch plus a little protein, and it makes up most of the grain.

Milling does one thing: it grinds off that middle ring and leaves only the white endosperm. What you gain is a soft bite and a long shelf life (with less fat, the rice is slower to go rancid). What you pay is the fiber, magnesium, B vitamins, and polyphenols.

Two small bowls side by side: light-brown rice on the left and polished white rice on the right. — A CLOSER LOOK
One grain, with its outer layers milled away
Both forms have had their husks removed. Polishing also removes bran and germ, leaving mainly endosperm. The bowls do not represent equal-weight portions.

Educational content, not medical advice — consult a clinician.

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