soy milk
fortified soy milk has a similar nutrient and protein profile to cow’s milk and has the added advantage over all competitors because it contains a wide array of soy-based compounds with unique health benefits, including the potential of lowering “bad” cholesterol. soy also requires the least amount of water and produces the least amount of greenhouse gas emissions.
while some people attempt to tear down soy by saying it is genetically modified (gmo), and bad for the environment,” the majority of gmo soy that is grown is used to feed animals, not to make soy milk or soy products.
with eight grams of protein per serving, soy milk is nutritionally on par with cow’s milk and represents, in my opinion, the strongest plant-based milk candidate.
for the plant-based milk alternatives listed next, you are looking at no more than one to two grams of protein per cup.
oat milk
oat milk lacks the protein and unique array of plant-based compounds of soy milk, but if fortified, will have a similar nutrient profile. it is considered among the most environmentally friendly milk alternatives alongside soy and uses less land and water than other plant milks.
almond milk
almond milk requires the least land use, but most water use, among plant-based milk alternatives, which arguably makes it one of the least sustainable plant milks. from a nutrition standpoint, almond milk contains very little protein, but fortified versions will deliver a nutrient profile similar to other milks.