The Summary
Researchers conducted a randomized controlled trial with 60 healthy adults to test how five common food emulsifiers affect the body. Participants ate an emulsifier-free diet for two weeks, then received specific emulsifiers or a placebo for four weeks. The emulsifier-free diet significantly lowered cholesterol levels. While adding emulsifiers back did not cause immediate intestinal or systemic inflammation, it altered gut bacteria and decreased levels of beneficial short-chain fatty acids, particularly with carboxymethyl cellulose. Additionally, the emulsifier carrageenan increased intestinal permeability.
Why this is interesting
Food emulsifiers are additives used to improve the texture and shelf-life of processed foods. While animal studies previously hinted they might cause inflammation, human data has been limited. This trial shows that while eating these additives for a short time does not trigger immediate inflammation, it does reduce beneficial compounds called short-chain fatty acids produced by gut microbes. Furthermore, avoiding them altogether quickly lowers cholesterol. For readers, this suggests that cutting back on ultra-processed foods containing emulsifiers could be a simple way to improve metabolic health.