When we think of milk, the first image that comes to mind is a strong set of bones. But dairy is so much more than a source of calcium. From supporting our immune system to building muscles, dairy plays a crucial role in everyday nutrition. In this blog, we will dive into the science-backed benefits of dairy, while also addressing what it means for people living with kidney disease.
🧰Dairy and Bone Health: The Classic Duo
Dairy is a rich source of calcium and vitamin D, the two nutrients most closely associated with bone strength. Calcium helps in the mineralization of bones and teeth, while vitamin D enhances the absorption of calcium from the gut.
A study published in Osteoporosis International (Weaver et al., 2016) showed that adolescents who consumed adequate dairy had higher peak bone mass, which reduces the risk of osteoporosis later in life.
Kidney Consideration: In chronic kidney disease (CKD), calcium and phosphorus metabolism can be disturbed. Dairy products, while high in calcium, also contain phosphorus, which can accumulate in CKD patients and lead to vascular calcification or bone problems. Hence, portion control and choosing low-phosphorus dairy products like cream cheese, brie, or rice milk may be safer options (National Kidney Foundation, 2020).
🫡 Dairy and Immunity: Fuel for Your Inner Defence
Dairy provides several micronutrients that are crucial for immune health:
- Zinc supports wound healing and white blood cell function.
- Vitamin A maintains the integrity of mucosal surfaces like the respiratory tract.
- Selenium has antioxidant properties that reduce inflammation.
According to a review published in Nutrients (Gombart et al., 2020), these nutrients collectively support both innate and adaptive immune responses.
Kidney Consideration: Patients with CKD are more vulnerable to infections due to reduced immune function. However, care must be taken with selenium and vitamin A, which can accumulate in advanced CKD. It’s best to get these nutrients in moderation through diet rather than supplements unless supervised by a healthcare provider (Kidney Health Australia, 2022).
💪 Protein Power: Muscle Health and Weight Maintenance
Milk and its derivatives supply complete proteins, making them a valuable source of all necessary amino acids for the body. Proteins such as casein and whey found in milk are known for their easy digestibility and role in muscle recovery and enhancing the feeling of fullness.
A study published in The American Journal of Clinical Nutrition (Phillips et al., 2016) highlights the value of dairy-based proteins in preserving muscle mass, particularly among older adults.
Kidney Insight: For individuals with chronic kidney disease (CKD), protein needs depend on the stage of the condition. Lowering protein consumption in the early phase of kidney disease can reduce pressure on the kidneys. However, for those undergoing dialysis, a higher protein intake is essential to replace what is lost during treatment. A registered renal dietitian can tailor protein recommendations to individual needs (National Kidney Foundation, 2020).
🌚 Better Sleep and Brain Health
Milk contains tryptophan, an amino acid that promotes the production of serotonin and melatonin, helping regulate sleep cycles. Additionally, dairy provides vitamin B12 and iodine, both of which are essential for brain development and cognitive function.
Kidney Consideration: Neurological symptoms like confusion and poor sleep are common in advanced CKD. Incorporating dairy with tryptophan and B12 might help support mental wellness, though phosphorus and potassium content must be managed.
🌾 Lactose Intolerance and Plant-Based Alternatives
For those who are lactose intolerant, options like lactose-free milk, yogurt with live cultures, and fortified plant-based milks (soy, almond, rice) are good alternatives.
Kidney Tip: Some plant-based milks are lower in potassium and phosphorus, making them suitable for kidney patients. Always check the labels for added phosphates or potassium additives.
DaVita (2023) recommends unsweetened, low-potassium varieties of plant-based milk for people with CKD.
✅ Conclusion
Dairy is far more than just a bone-building beverage. From boosting immunity to preserving muscles and even supporting better sleep, it plays multiple roles in a healthy diet. However, for individuals with kidney disease, making mindful choices about the type and amount of dairy consumed is crucial. Partnering with a renal dietitian ensures you get the benefits without the risks.
📛 References
- Weaver CM et al. (2016). “The National Osteoporosis Foundation’s position on peak bone mass development.” Osteoporos Int. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4997434/
- Gombart AF, Pierre A, Maggini S. (2020). “A Review of Micronutrients and the Immune System.” Nutrients. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7019735/
- National Kidney Foundation. (2020). Protein and CKD
- Kidney Health Australia. (2022). Nutrition and Immunity
- DaVita. (2023). Milk Alternatives for CKD
