(8 mins) Transcript. This video is somewhat complex. First, Dr Greger explains that an association between dairy products and prostate cancer has been observed. At the same time, a negative association between milk consumption and colorectal cancer has also been observed. Then Dr Greger argues that it's the calcium in milk that's hypothesized to be protective against colorectal cancer. Now calcium may be derived in abundance from low-oxalate dark leafy greens, beans, split peas, chickpeas and lentils (or if necessary, through calcium-fortified foods like soy or almond milk). Dr Greger then asks, "what may we do to get the best of both worlds?" In other words, what should we do reduce our risk of both prostate cancer and colorectal cancer? Here is an idea: drop milk and dairy products (this reduces our risk of prostate), start getting calcium from plant-based sources just described (this reduces our risk of colorectal cancer).

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(5 mins) Transcript. Most of this video explains how we ingest hormones via milk and dairy products, and how most people are unaware of this fact.

All animal products have hormones. Dairy has more hormones than meat (even if cows are not given growth hormones for increased milk production). Some examples are estrogen, estradiol, pregnanediol. About 80% of hormones intake from food comes from dairy. The rest are evenly split between eggs and other animal products.

Nowadays, Holstein cows (the most common dairy cow in USA) are kept pregnant while they are lactating. Dr Greger's video shows that during the last 4 months (the latter half of a cow's pregnancy), hormone levels shoot up about 8x to 10x their levels in the first 4 months.

When men or prepubertal children consume dairy, within a few hours, the concentration of dairy hormones (which are also found in human bodies) shoots up in their bodies to 3x or 4x their baseline levels. Women generally have

Towards the end, Dr Greger says, "Harvard researchers followed tens of thousands of women — and their dairy consumption — for decades, and found a significantly higher risk of endometrial cancer among postmenopausal women who consumed more dairy."

(4 mins) Transcript. Dr Greger's summary: "Does the hormonal stimulation of human prostate cancer cells by cow milk in a petri dish translate out clinically in studies of human populations?"

(4 mins) Transcript. Dr Greger's summary: "The buildup of industrial toxins in the meat and dairy supply may, in part, account for the relationship between animal fat consumption and disease."

This video summarizes several studies that show increase in {cancer, Parkinson's, heart disease} with increase in dairy consumption. Dr Greger hypothesizes that perhaps it's the accumulation of industrial carcinogens (PCBs, PBDEs, …) that accumulate in animal fat.

Talk at Healthy Lifestyle Expo 2005.