@sihha The research about soy and risk of breast cancer can be confusing due to a variety of studies that look at the type of soy foods, the age of intake, and the type of cancer. When the research is looked at as a whole it shows that soy foods do not increase the risk of breast cancer. The Disease Fighting Foods video has information about soy about 14:35 minutes into the video. You can also find information on the American Institute for Cancer Research: https://www.aicr.org/cancer-prevention/food-facts/soy/
The recommendation is a moderate intake which means up to 1-2 servings per day.

Some examples of 1 serving equals:
Tofu: 1/3 cup of tofu or 4 ounce by weight, or approximately ¼ of block
Shelled edamame: ½ cup
Soy milk: 1 cup
Soy nuts: 1 ounce, 1/3 cup

Lactose free milk can be another way to get calcium and vitamin D. Sometimes people are able to tolerate yogurt instead of milk.
I hope this clarifies some of the confusion surrounding soy.