Colorful rice varieties may be more than just pretty on the plate

Researchers at Hokkaido University analyzed 56 varieties of Japanese japonica rice and discovered that black and green pigmented varieties contain a surprisingly rich array of beneficial fats — including compounds never before detected in rice. The study, published in Food Research International, used advanced techniques like liquid chromatography and mass spectrometry to identify 196 distinct lipid molecules across five major groups.

Black and green rice stood out for their unique lipid profiles, containing FAHMFAs (fatty acid esters of hydroxy medium-chain fatty acids) and LNAPEs — compounds previously linked to anti-inflammatory activity and improved metabolic health in other biological systems. This marks the first time FAHMFAs have been found in rice. Lab-based digestion tests also showed that black and green rice break down starch more slowly than white rice, meaning glucose enters the bloodstream more gradually after a meal.

By the Numbers

• 56 japonica rice cultivars examined from across Japan
• 196 distinct lipid molecules identified across 5 major groups
• Rice is a dietary staple for more than 50% of the world's population; lipids make up only ~2% of the grain

Why it matters: These findings could pave the way for new "functional" rice products aimed at better managing diabetes and other lifestyle-related diseases — offering a simple, food-based approach to metabolic health.