Our goal was to compare nutritional status on serum proteins and lipids, and to determine the effect of egg supplements in primary school students aged 6–15 years. 417 children were randomized to an addition of either three or ten eggs per week to their basal diets for 12 weeks. Anthropometric and biochemical indices were continuously monitored. 29.1% and 20.8% of the participants had evidence of protein malnutrition according to low serum albumin and prealbumin levels, respectively. Albumin and prealbumin levels positively correlated with total cholesterol and LDL‐C levels. No difference in any biochemical index was found comparing 3 vs 10 eggs/wk. During egg supplement, total cholesterol, LDL and ratio of total cholesterol to HDL levels decreased by 6.4±1.8, 19.3±2.5 and 28.5±2.1% in three eggs diet and by 8.0±1.9, 15.7±3.0 and 31.2±1.9% in 10 eggs diet, respectively (p < 0.001). Albumin, prealbumin and HDL levels all the significantly increased (p < 0.001). Our study demonstrated that in Thailand there are still primary school students with protein malnutrition in rural areas. Supplement of at least 3 eggs/wk can effectively correct parameters of protein malnutrition in Thai primary school students, and have beneficial outcomes on blood lipid levels.Supported by National Research Council of Thailand 2549Grant Funding Source: The ASN/Procter & Gamble Graduate Student Research Awards Competition