Can soya milk really cause cancer?
Soya products and cooked soybeans are safe at a wide range of intakes. However, a small percentage of people have allergies to soybeans and thus should avoid soya products. Soya isoflavones have been reported to reduce thyroid function in some people.17 A preliminary trial of soya supplementation among healthy Japanese, found that 30 grams (about one ounce) per day of soybeans for three months, led to a slight reduction in the hormone that stimulates the thyroid gland.18 Some participants complained of malaise, constipation, sleepiness, and even goitre. These symptoms resolved within a month of discontinuing soya supplements. However, a variety of soya products have been shown to either cause an increase in thyroid function19 or produce no change in thyroid function.20 The clinical importance of interactions between soya and thyroid function remains unclear. However, in infants with congenital hypothyroidism, soya formula must not be added, nor removed from the diet, without consultati