Unsweetened almond milk is a solid choice for most adults, especially if you’re looking to cut calories or avoid dairy. At just 40 calories per cup with 1 gram of carbohydrates, it’s one of the lightest milk options available. But it comes with some real nutritional trade-offs worth understanding before you make it your everyday milk.
What’s Actually in a Cup
An 8-ounce serving of unsweetened almond milk contains 40 calories, 2.5 grams of fat, 1 gram of carbohydrates, and 1 gram of protein. For context, that’s roughly a third of the calories in a cup of 2% dairy milk. The fat it does contain is mostly monounsaturated, the same type found in olive oil and avocados, which is linked to lower LDL (“bad”) cholesterol levels. That said, almond milk contains far fewer of these fats than whole almonds do, so it’s not a meaningful source on its own.
Most commercial brands are fortified with calcium, vitamin D, and vitamin E, which brings its micronutrient profile closer to dairy milk. But fortification varies widely between brands, so checking the label matters. Some brands deliver 45% of your daily calcium needs per cup, while others offer much less.
Where It Falls Short: Protein
This is the biggest gap. Cow’s milk has a little over 8 grams of protein per cup. Unsweetened almond milk has just 1 gram. That’s a massive difference, and it matters if almond milk is your primary milk source. You won’t get enough protein from it to support muscle maintenance, satiety after meals, or the growth needs of young children.
If protein is a priority, soy milk is the plant-based option that comes closest to dairy, typically offering 7 to 8 grams per cup. You can also compensate by getting protein from other parts of your diet, but it’s worth being intentional about it rather than assuming almond milk fills the same role as cow’s milk.
Thickeners and Additives
Unsweetened almond milk is mostly water and a small percentage of almonds, so manufacturers add thickening agents to give it a creamier texture. Common ones include guar gum, xanthan gum, and gellan gum. Some brands also use carrageenan, a stabilizer derived from red seaweed, which has attracted more scrutiny.
Research on carrageenan has raised concerns about its potential to trigger inflammation, increase intestinal permeability, and disrupt gut bacteria. A 2021 review found a possible link between higher carrageenan intake and the risk of relapse in people with inflammatory bowel disease. A 2024 clinical trial also suggested a relationship between carrageenan-heavy diets and insulin resistance tied to intestinal barrier disruption. However, studies also show that 98% to 100% of food-grade carrageenan passes through the body without breaking down into its more harmful degraded form.
Many brands have voluntarily removed carrageenan in response to consumer demand. If you’d rather avoid it, the ingredient list will tell you clearly whether it’s included.
Kidney Stone Risk
Almonds are naturally high in oxalates, compounds that can bind with calcium in the kidneys and form stones. Research published in the Journal of Renal Nutrition found that almond milk has the highest oxalate concentration among plant milks tested, followed by cashew, hazelnut, and soy. Oat, rice, and soy milk all compare more favorably to dairy milk in terms of kidney stone risk factors.
If you’ve had calcium oxalate kidney stones or been told you’re at risk, almond milk is probably not your best plant-based option. Oat or soy milk would be a safer swap.
Almond Milk for Young Children
The CDC advises that fortified dairy alternatives, including almond milk, should not be given before 12 months of age. After age one, fortified unsweetened almond milk can count toward a child’s dairy needs, but only if it’s fortified with both calcium and vitamin D. The CDC specifically recommends choosing unflavored, unsweetened varieties and checking labels carefully, since nutrient content varies between brands.
Given almond milk’s very low protein content, it’s worth discussing with your child’s pediatrician whether it’s adequate as a primary milk. For toddlers who aren’t big meat or legume eaters, that missing protein could be harder to make up elsewhere.
The Water Footprint Question
Almond milk uses significantly less water than dairy milk, roughly 333 liters of water per liter of almond milk compared to about 628 for dairy. But among plant milks, almonds are the thirstiest crop. Oat and pea milk both have lower water footprints. Most almond farming is concentrated in drought-prone California, which adds to the environmental concern. If sustainability is part of your decision, oat milk edges ahead on water use.
Who Benefits Most
Unsweetened almond milk works well if you’re managing your weight, limiting carbohydrates, or avoiding dairy due to lactose intolerance or a milk allergy. Its low calorie and sugar content makes it one of the leanest options for smoothies, coffee, and cereal. It’s also a reasonable choice for people monitoring blood sugar, since 1 gram of carbohydrate per cup has minimal glycemic impact.
It’s less ideal as a nutritional replacement for cow’s milk if you’re relying on it for protein, if you have a history of kidney stones, or if you’re feeding a toddler who needs calorie-dense nutrition. In those cases, soy milk or fortified oat milk often fills the gap better. For most healthy adults who eat a varied diet, though, unsweetened almond milk is a perfectly good everyday choice.