Over the past few weeks, several people have come to me with concerns about eating soy. In light of this, I thought I would attempt to clear the air with a post on the great soy debate.
Soy products, including tofu, soy beans, tempeh, and edamame, naturally contain compounds called isoflavones that are similar to the female hormone estrogen. Those who worry about eating soy are usually concerned that consumption of these foods will lead to hormonal disruptions in the body.
There is limited research on fertility. One study showed that men who ate soy had lower sperm concentrations than those who didn’t – however, in most cases the sperm levels were still normal. It was a small study of only 99 men.
Women with breast cancer and survivors of breast cancer tend to shy away from soy. This is because the estrogen-like compounds in soy are thought to promote the growth of hormone-sensitive tumours. Research in this area is inconclusive, so prudent recommendations exist: moderate amounts of soy (several servings a day) are probably okay if you’ve previously had breast cancer, but don’t consume large amounts if you have early-stage breast cancer.
If these theoretical concerns exist, why even bother eating soy? The amount of meat our society consumes is putting serious stress on the environment. Plant-based proteins like soy can displace meat from the diet, leading to a happier, healthier earth.
Nutritionally, soy is a good source of high-quality protein. Like meat, it contains all of the essential amino acids that our body needs to function, build muscle, and repair itself. Soy is low in saturated fat, and has been shown to protect against heart disease by reducing LDL (bad) cholesterol when 3 servings or more are consumed daily. If consumed regularly in childhood and adolescence, soy products may play a role in preventing some hormone-related cancers. Unlike meat, soy is a good source of calcium, which many people do not get enough of.
Have I convinced you to try adding a little soy into your diet? If so, an easy place to start is edamame (those little green beans served at Japanese restaurants). Almost as simple is this recipe for easy baked tofu. A basic marinade of soy sauce, ketchup, and sesame oil gives the tofu a salty-sweet taste, and roasting it until it’s firm and caramelized builds extra flavour. I’ve been making this dish for years and it’s become a regular protein in my weekday salads. Asian-inspired ingredients like mandarin orange segments, rice, and sesame dressing pair nicely with the tofu, but the marinade is neutral enough that it would work with almost any salad ingredients.
Easy Baked Tofu
(adapted from Moosewood Restaurant Cooking for Health)
If you’ve never tried tofu before, you may need to give it a chance on several separate occasions – it’s an acquired taste!
1 cake of extra-firm or firm tofu (16 ounces)
1 tablespoon sesame oil (the original recipe calls for 2 tbsp, but I find this a bit oily)
2 tablespoons low-sodium soy sauce
2 tablespoons ketchup
Cut the tofu into bite-sized cubes and place in a baking dish large enough to hold a single layer. For easier clean up, line with foil. Stir together the sesame oil, soy sauce, and ketchup and drizzle over the tofu. With a rubber spatula, gently turn to coat thoroughly. In a 400 degree Fahrenheit oven, bake uncovered for 30 to 40 minutes, stirring once or twice. until tofu is browned, firm and chewy. Serve hot, at room temperature, or chilled.
Makes 4 servings. Per serving: 104 kcal, 6 g fat (0.5 g saturated), 5 g carbohydrate, 0 g fibre, 9 g protein, 360 mg sodium