This info is in line with other findings I've read  re the unnaturally high levels of hormones, such as oestrogen, in dairy. I have to admit it's very convincing -  most dairy-related studies tend to primarily  focus on the unnaturally high levels of calcium and immuno-reactive proteins within dairy, so this sort of research  is refreshing.
 
Geoff



> Date: Sat, 22 Dec 2007 16:00:03 -0500> From: [log in to unmask]> Subject: PALEOFOOD Digest - 10 Dec 2007 to 22 Dec 2007 (#2007-327)> To: [log in to unmask]> > There are 3 messages totalling 165 lines in this issue.> > Topics of the day:> > 1. Milk Products Are a Source of Dietary Progesterone. Abstract 2028 (3)> > ------=-=-=-=-=-=-=- IMPORTANT NOTICE -=-=-=-=-=-=--------> Make sure you have a subject line that reflects your topic> Do not have a subject that says Re: PALEOFOOD Digest - ...> > ----------------------------------------------------------------------> > Date: Sat, 22 Dec 2007 11:14:56 -0700> From: Kathryn Rosenthal <[log in to unmask]>> Subject: Milk Products Are a Source of Dietary Progesterone. Abstract 2028> > The following abstract was presented at the San Antonio breast Cancer => symposium.> > Kath> Progesterone in Dairy Products Poses Risks: Presented at SABCS> By John Gever> > SAN ANTONIO, TX -- December 14, 2007 -- Physicians may want to advise => patients who are at high risk for breast cancer and other => progesterone-sensitive conditions to avoid ice cream, butter, and other => fatty dairy products, based on a study presented here at the 30th Annual => San Antonio Breast Cancer Symposium (SABCS).> > People absorb significant amounts of bovine progesterone (identical to => human progesterone) from dairy products, thanks to the practice among => dairy farmers of keeping dairy cattle pregnant most of the time, => according to research led by William H. Goodson III, MD, Senior Clinical => Research Scientist, California Pacific Medical Research Institute, San => Francisco, California.> > "Given the magnitude of milk use, we must consider the possibility that => a single change in food production technology might have a major => influence on the health of young persons who, with the best of => intentions, are encouraged to drink milk," the report said.> > Dr. Goodson presented the findings in a poster session on December 14. => His group measured salivary progesterone levels in 17 male volunteers at => baseline and 24 hours later after consuming three servings of high-fat => dairy foods (2 tablespoons butter, 2 ounces cheese, and a quart of => premium ice cream) between morning and afternoon. The procedure was => repeated a week later.> > Salivary progesterone levels were seen to spike by 30% to 100% in nearly => all subjects after both sets of feedings.> > Dr. Goodson said males were chosen because their normal concentrations => of progesterone are lower and less cyclic than in females and hence an => effect would be easier to measure.> > "I'm more concerned about what happens in very young people, early in => life when differences between males and females are less [significant]," => Dr. Goodson said.> > Dr. Goodson said most dairy cows began to be maintained in nearly => constant pregnancy in the mid-20th century to maximize calf production. => This results in increased progesterone levels in milk.> > Unnoticed dietary progesterone might explain several medical trends => identified in the latter half of the 20th century, including rising => incidence of breast cancer and progressively earlier menarche in girls, => Dr. Goodson's group suggested.> > Because progesterone dissolves readily in fat, it should be absorbed => more efficiently in high-fat products. Dr. Goodson said that plain milk, => either skim or whole, is probably a less important source of dietary => progesterone due to low concentration of fat (4% for whole milk). "It's => the high-fat things that really get to you," he said.> > The group measured progesterone levels in high-fat dairy products. Foods => that were 70% to 80% dairy fat contained 175 to 300 ng/mL of => progesterone, they found.> > "The amount of progesterone in 200 mL of ice cream would be => approximately one-one-hundredth of a pharmacological adult dose of 2 => mg," according to the report.> > Several previous studies have concluded that dairy consumption is => unrelated to breast cancer incidence, according to Dr. Goodson and => colleagues. But they also pointed to a more detailed study that examined => particular dairy products, which did find associations between breast => cancer incidence and high-fat cheeses as well as milk consumed in => adolescence.> > Another study found that women who ate ice cream -- but not low-fat => frozen yogurt -- were significantly more likely to become pregnant. Dr. => Goodson said dietary progesterone in ice cream could have been => responsible by serving as progesterone replacement in women who may have => luteal insufficiency, a form of infertility marked by low progesterone => availability.> > The implications of this hidden source of dietary progesterone are => largely unexplored, Dr. Goodson said. "You could speculate a lot. It's => an interesting place to begin speculating," he said.> > > [Presentation title: Milk Products Are a Source of Dietary Progesterone. => Abstract 2028]=20> 
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