We conducted a randomized placebo-controlled, double-blind trial. A total of 61 healthy volunteers aged42-83 years were enrolled and were randomly divided into a royal jelly group (n = 31) and a control group (n = 30).Three thousand mg of royal jelly (RJ) or a placebo in 100 ml liquid/day were ingested for 6 months. The primary outcomes were changes in anthropometric measurements and biochemical indexes from baseline to 6 months after intervention.