A high-protein diet can help you shed excess pounds and maintain a healthy weight. Protein can help you feel full and improve your satisfaction after the meal. Like all dairy products, casein contains the sugar lactose. If you have lactose intolerance, your small intestine can’t digest milk sugar. When you have dairy products, you may develop symptoms including: Tarnopolsky MA, Parise G, Yardley NJ, et al. Creatine-dextrose and protein-dextrose induce similar strength gains during training. Med Sci Sports Exerc 2001;33(12):2044-52. View abstract.

Lollo PC, Amaya-Farfan J, de Carvalho-Silva LB. Physiological and physical effects of different milk protein supplements in elite soccer players. J Hum Kinet 2011;30:49-57. View abstract. Meinertz, H., Nilausen, K., and Faergeman, O. Soy protein and casein in cholesterol-enriched diets: effects on plasma lipoproteins in normolipidemic subjects. Am J Clin Nutr 1989;50(4):786-793. View abstract.Jenkins DJ, Srichaikul K, Wong JM, et al. Supplemental barley protein and casein similarly affect serum lipids in hypercholesterolemic women and men. J Nutr 2010;140(9):1633-7. View abstract. Dalais, F. S., Ebeling, P. R., Kotsopoulos, D., McGrath, B. P., and Teede, H. J. The effects of soy protein containing isoflavones on lipids and indices of bone resorption in postmenopausal women. Clin Endocrinol.(Oxf) 2003;58(6):704-709. View abstract. Weisse K, Brandsch C, Zernsdorf B, et al. Lupin protein compared to casein lowers the LDL cholesterol:HDL cholesterol-ratio of hypercholesterolemic adults. Eur J Nutr 2010;49(2):65-71. View abstract. Casein supplements do have lower amounts of lactose,” Homan states. “If you’d like to include casein in your diet but have a lactose sensitivity, the supplement might not trigger it. Talk to your healthcare provider if you’re interested in taking a supplement.” Protein restrictions Newmark LM. International Milk Genomics Consortium. Milk casein proteins: Ancient, diverse, and essential.

A casein allergy occurs when your body's immune system mistakenly thinks the protein is harmful and inappropriately produces allergic (IgE) antibodies for protection. Within minutes, the interaction between these antibodies and the specific protein triggers the release of body chemicals such as histamine that cause symptoms which may include:Casein allergies are not as common in adults as in children, but they do exist,” notes Homan. If you suspect you have a milk allergy, an allergist can do a test to figure out what you’re allergic to. Lactose intolerance Cribb PJ, Wiliams AD, Carey MF, Hayes A. The effect of whey isolate and resistance training on strength, body composition, and plasma glutamine. Int J Sport Nutr Exerc Metab 2006;16:494-509. View abstract. High levels of cholesterol or other fats (lipids) in the blood ( hyperlipidemia). Most research shows that casein protein does not improve "good" or "bad" cholesterol levels in people with normal cholesterol or in people with high cholesterol. But some small studies show that it might improve these levels in some people. Also, eating casein protein seems to lower the levels of a certain type of cholesterol called lipoprotein(a).