PROBLEM TO BE SOLVED: To provide a nutrition enriched powdered food soluble in 70-100°C water without becoming undissolved powder lumps, even though highly containing slightly soluble whey protein, and allowing a patient of surgery, an elderly person, or a patient in a poor nutritional state, orally requiring nutritional support to easily orally ingest it as warm meal.SOLUTION: This nutrition enriched powdered food is dissolved in 70-100°C water without becoming undissolved powder lumps by including 0.002-0.02 pt.mass of lecithin, based on 1 pt.mass of whey protein, in slightly soluble whey protein in 70-100°C water. The food allows a patient of surgery, an elderly person, or a patient in a poor nutritional state, orally requiring nutritional support to easily orally ingest it as warm meal, owing to substantially including no lipid and no dietary fiber.COPYRIGHT: (C)2013,JPO&INPIT【課題】70~100℃の水に難溶解性の乳清たんぱく質を高含有しても「ままこ」や「だま」になることなく溶解し、経口的に栄養補給を必要とする外科手術患者や高齢者あるいは低栄養状態の患者などが温かな食事として経口摂取しやすい高栄養強化用粉末食品を提供すること。【解決手段】70~100℃の水に難溶解性の乳清たんぱく質に、レシチンを乳清たんぱく質1質量部に対して0.002~0.02質量部を含有させることにより、70~100℃の水に「ままこ」や「だま」になることなく溶解することができ、実質的に脂質および食物繊維を含有しないことから、経口的に栄養補給を必要とする外科手術患者や高齢者あるいは低栄養状態の患者などが温かな食事として経口摂取しやすい栄養強化用粉末食品に関するものである。【選択図】なし