A glass of milk a day delivers calcium, magnesium, and more.
Key Takeaways
- Drinking milk daily can support strong bones and muscle health thanks to its mix of calcium, vitamin D, phosphorus, and high-quality protein.
- It can also help with fullness and heart health, as its protein and key minerals contribute to satiety and healthy blood pressure.
- For most people, daily milk is safe and beneficial, but those with lactose intolerance or dairy allergies may need alternatives like lactose-free milk.
Despite the growing popularity of dairy-free milk, cow’s milk is still a popular drink. It’s also generally considered a healthy choice, especially when it comes to bone health and muscle growth. And whether you enjoy milk on its own, with cereal, or in smoothies or other recipes—drinking milk every day certainly has its perks. Here, nutrition experts share how daily milk intake can affect your body, plus how much to drink for optimal health benefits.
Meet Our Expert
- Adrienne Bitar, PhD, a lecturer in food studies at Cornell University
- Lauren Manaker, MS, RDN, LD, a registered dietitian and founder of Nutrition Now Counseling
Milk Nutrition
Cow’s milk is a source of protein, along with essential minerals like calcium, magnesium, and potassium. And that’s not all! “In the U.S., most milk is fortified with vitamin D, which is a nutrient of concern,” says Adrienne Bitar, PhD, a lecturer in food studies at Cornell University. (The concern stems from the fact that the body relies on sun exposure to produce vitamin D, but many of us don’t get enough during the winter months. There are also very few natural sources of vitamin D.)
Here’s a look at the nutritional profile of 1 cup (249 grams) of whole milk, according to data from the USDA:
Macronutrients
Calories: 152
Protein: 8.14 grams (g)
Carbohydrates: 11.5 g
Fat: 6.9 g
Micronutrients
Calcium: 306 milligrams (mg)
Magnesium: 29.6 mg
Phosphorus: 251 mg
Potassium: 374 mg
Sodium: 94.6 mgSmall amounts of zinc, selenium, and iodine
What Happens When You Drink Milk Every Day?
So how does drinking or consuming milk everyday actually impact your body and overall health? Here’s what the experts say.
You'll Support Bone Health
If milk had a claim to fame, it would be bone health. “Drinking milk daily can support bone health due to its content of many bone health-supporting nutrients, including calcium, vitamin D, and phosphorus,” explains Lauren Manaker, MS, RDN, LD, a registered dietitian and founder of Nutrition Now Counseling. “Calcium is the primary mineral that helps maintain bone tissue, while vitamin D enhances calcium absorption and supports bone remodeling—the process of replacing old bone tissue with new. Phosphorus works alongside calcium to fortify the bone structure, ensuring bones remain dense and resilient,” Manaker adds. Bitar also calls out the magnesium in milk, another mineral that’s critical for calcium absorption.
You'll Promote Muscle Growth
“Milk is a cost-effective and accessible source of protein,” says Bitar. “It contains both whey and casein proteins, which contain essential amino acids that the body needs for muscle repair and building,” Manaker says. She adds: “Whey protein is quickly absorbed, making it ideal for post-workout recovery, as it delivers amino acids to the muscles rapidly. Casein, on the other hand, is digested more slowly, providing a steady release of amino acids that support muscle maintenance over time. Together, these proteins help promote muscle growth, strength, and recovery when paired with regular exercise.”
You’ll Feel More Satisfied
With milk in your daily repertoire, you’ll experience more satiety and fullness. This is primarily due to its protein content, according to Manaker. “Milk contains high-quality protein, which slows digestion and helps regulate hunger hormones, keeping you satisfied for extended periods,” she says. Additionally, 2 percent milk or whole milk contains fat, which further enhances this effect by providing a steady source of energy, Manaker notes.
You’ll Help Heart Health
“Drinking milk daily can support heart health, thanks to its content of calcium, potassium, and magnesium,” says Manaker. That’s because all three minerals help reduce high blood pressure, or hypertension, a major risk factor for heart disease. According to Manaker, calcium helps blood vessels contract and relax properly, ensuring smooth blood flow. Meanwhile, potassium counteracts the effects of sodium (a nutrient that can cause high blood pressure in high amounts) and magnesium widens blood vessels, thereby regulating blood pressure.
Potential Downsides of Drinking Milk Daily
“For most people, drinking milk every day is safe and beneficial, as long as they do not have a milk allergy,” says Manaker. In this case, milk and dairy products can trigger an adverse immune response, so you’ll want to steer clear if you have an allergy.
Similarly, if you’re lactose-intolerant, avoid drinking regular milk. “Lactose-free milk is an excellent alternative, as it provides the same nutrients without the lactose sugar,” Manaker shares.
There are other medical conditions that might warrant nixing milk from your cart, too. “Certain rare metabolic disorders, such as galactosemia, require individuals to eliminate milk and dairy products from their diet due to the inability to process galactose—a sugar found in milk,” Manaker explains. Also, for some folks, eating dairy can cause acne—so if you’re prone to breakouts, you might want to be mindful of milk.
How Much Milk Should You Drink?
As Manaker mentioned above, for most people drinking milk daily is safe and beneficial, so long as they don’t have an allergy to the popular beverage. For lactose intolerant folks, Manaker calls lactose-free milk “an excellent alternative” to typical dairy milk because it provides the same nutrients without the problematic lactose sugar.
The daily recommended intake of milk (or dairy products in general) also varies by age and individual needs, but generally, three servings of dairy per day is the sweet spot for adults, according to Manaker. Bitar echoes this notion, sharing that three servings of milk or dairy products can help most of us reach the RDA (recommended dietary allowance) for calcium. “Women over 50, however, need four servings of milk or dairy to reach their RDA of 1200 milligrams of calcium a day,” says Bitar.
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