News and Document archive source
copyrighted material disclaimer at bottom of page

NewsMinenature-healthhealthcancer — Viewing Item


Hormones in milk are linked to cancer

Original Source Link: (May no longer be active)
   http://www.consumerhealthjournal.com/articles/milk-and-cancer.html

http://www.consumerhealthjournal.com/articles/milk-and-cancer.html

Hormones in Milk Are Linked to Cancer

March 2004

by Alison Stewart

Studies link dairy consumption to ovarian and breast cancer in women and prostate cancer in men. Milk, both human and cow, has naturally-occurring growth hormones that can become cancerous in adults, whose bodies are supposed to have finished their growth spurts.

Biology

One reason milk consumption may lead to cancer risk is insulin-like growth factor, IGF-1 (not to be confused with bovine growth hormone, rBGH). Milk contains IGF-1 for good reason: milk is designed for babies, and IGF-1 helps us grow. IGF-1 affects growth, as well as other functions, and is normally found in our blood. Higher levels of IGF-1, however, appear to stimulate cancer cells.

"IGF-1 in milk is a growth factor," said Dr. Amy Joy Lanou, nutrition director for the Physicians Committee for Responsible Medicine. "Adult bodies are no longer growing. Lots of excess growth factors floating around are likely to find cancerous cells to act upon," Lanou said.

Cow's milk has IGF-1, and IGF-1 levels increase in cows treated with bovine growth hormone, rBGH. (Estimates range from twice as high to ten times higher.) Also, pasteurization does not destroy IGF-1, but increases its concentration instead.

There is IGF-1 in cow's milk that is identical to the IGF-1 found in humans already, which could lead to the ease with which we absorb it from milk. IGF-1 is found in higher concentrations in the bodies of people who consume dairy products.

Study Analysis

"IGF-1 appears to be a very good indicator of cancer risk," said Dr. Colin Campbell, nutritional biochemistry professor at Cornell University.

Though diets high in calories or in animal proteins also boost IGF-1 levels, milk seems to be worse than other foods. A 1999 study showed that adding three eight-ounce servings of milk per day to the diet for 12 weeks caused a 10 percent increase in IGF-1 levels. ("Dietary changes favorably affect bone remodeling in older adults" Journal of American Dietetic Association, 1999). In 1997, a similar study had similar results in teenage girls. ("Milk intake and bone mineral acquisition in adolescent girls," British Medical Journal, 1997).

And in terms of cancer causation, in pre-menopausal women, a 1998 study found that women with highest concentrations of IGF-1 had more than twice the risk of breast cancer as those women with lowest levels. Interestingly, there was no relationship between IGF-1 concentrations and breast cancer risk in post-menopausal women. ("Circulating concentrations of insulin-like growth factor-1 and risk of breast cancer," Lancet, 1998).

There are conflicting results in other studies, however. A 2002 study ("Intake of Dairy Products, Calcium, and Vitamin D and Risk of Breast Cancer, Journal of the National Cancer Institute, September 2002) found an association between intake of low-fat dairy products and a reduced risk of breast cancer. This could be because women who use low-fat dairy products are more likely to be health-conscious overall, or it could be that some forms of dairy help reduce cancer risk.

Ovarian cancer may also be linked to dairy consumption, but for a different or additional reason.

Our bodies break down milk sugar, lactose, into galactose. Enzymes then break the galactose into more usable sugars. When a woman's dairy consumption overloads the enzyme's ability to break down the galactose, it may build up in the blood or affect a woman's ovaries, according to the PCRM ("Women and Cancer," source, PCRM).

The PCRM explains how a 1989 study of hundreds of women with ovarian cancer found that the difference between them and a similar age and demographic group of women who did not develop ovarian cancer was their dairy intake, particularly their intake of yogurt and cottage cheese. ("Galactose Consumption and Metabolism in Relation to the Risk of Ovarian Cancer," Lancet, 1989.)

The problem wasn't the fat in milk -- it was the sugar in milk, so the bacteria in the yogurt and cottage cheese actually increased the conversion of lactose to galactose.

In addition to breast and ovarian cancer, prostate cancer may also be linked to dairy consumption. Neal Barnard, president of the PCRM, analyzed 23 studies relating to prostate cancer and milk consumption.

Barnard found that 6 out of 12 case-control studies and 5 out of 11correlation studies found significant associations between dairy intake and prostate cancer. Men with the highest levels of dairy intake were between 1.3 and 2.5 times more likely to get prostate cancer than those with the lowest consumption. (link to article).

As with breast cancer, increased IGF-1 levels from dairy may increase prostate cancer risk. In a 1998 study, men with the highest levels of IGF-1 had more than four times the risk of prostate cancer than men with the lowest levels of the growth factor. ("Plasma insulin-like growth factor-I and prostate cancer risk," Science, 1998)

Another reason milk may be linked to prostate cancer is the calcium in the milk -- the same calcium we're trying to get into our bones through our diet. This calcium may decrease the body's supply of a form of vitamin D that helps to protect against prostate cancer, according to a 2000 press release from the Harvard School of Public Health ("Higher Intake of Dairy Products May be Linked to Prostate Cancer Risk").

The press release explains a study that found a moderately higher risk of prostate cancer from high dairy intake. The researchers also discovered that men who drank more that six glasses of milk each week had lower levels of the vitamin D that could protect against cancer than did men who drank fewer than two glasses.


starches
1mil new skin cancer { May 27 2003 }
20 cancer fighting foods to eat all summer
African american women higher breast cancer { December 7 2003 }
All types of alcohol raise cancer risk
Antibiotic use causes cancer
Asians get cancer when in america
Asians low cancer rate
Beta carotene supplements
Blacks more likely die cancer
Breast cancer link to use of antibiotics
Breast cancer risk reduced by exercise
Broccoli helps prevent cancer { April 20 2005 }
California sues mcdonalds and potato chips over cancer
Cancer broccoli { May 28 2002 }
Cancer causing drug found in british poultry { October 21 2004 }
Cancer causing pesticides living in our bodies { June 21 2005 }
Cancer deaths decline first time since 1930 { February 9 2006 }
Cancer french fries { July 3 2002 }
Car exhausts may cause child cancer
Carbohydrates could be linked to breast cancer { August 9 2004 }
Carcinogen sealed glass jar foods
Carrots help cut cancer risk
Curry fights cancer
Curry fights prostate cancer study says { January 17 2006 }
Curry shuts down melanoma cancer tumors
Diet alcohol linked to one third cancer cases { May 20 2004 }
Diet and tobacco account for most cancer
Diet responsible for half cancers says fox files [wav]
Doctor in africa discovers western diet is cancerous { February 28 1911 }
Eating red meat increases risk of colon cancer
Eu beef cancer { May 4 1999 }
Fatty diet linked to cancer { March 21 2007 }
Garlic wards off cancer
Good night sleep fights cancer
Green tea cuts risk of cancer
Green tea reduces risk prostate cancer
Hair dyes linked to kind of cancer { January 24 2004 }
High fat diet increases breast cancer risk
High fat linked breast cancer { July 18 2003 }
High fiber reduces colon cancer { May 2 2003 }
High sugar diet linked to cancer { March 21 2007 }
Hormones in milk are linked to cancer
Meat and alcohol cause breast cancer
Meats and sweets boost cancer risk { July 10 2007 }
Microwaving plastic causes cancer in foods
Milk cause of cancer
Miso soup cuts breast cancer { June 18 2003 }
More causes cancer
Natural solutions for estrogen
New study says sun screen ineffective { June 15 2006 }
Nonfat milk linked to prostate cancer
Obesity linked to cancer { January 9 2006 }
One third cancer caused by diet
Pill linked to cancer { April 3 2003 }
Processed meats raise risk of cancer
Prostate testing debate
Red meat cancer { April 30 1996 }
Red meat diets cause cancer { April 7 2004 }
Red meat fuels bowel cancer risk { June 15 2005 }
Redheads risk of skin cancer without burns { August 29 2005 }
Regular aspirin use linked to cancer cases { January 9 2004 }
Study links breast cancer to antibiotic use { February 16 2004 }
Sun exposure may aid skin cancer victims { February 2 2005 }
Sunlight vit d prevents breast colon lung prostate cancer
Sunscreen blamed skin cancer
Sunscreens fails to prevent free radicals
Sunshine helps fight against breast cancer { August 4 2007 }
Sunshine may protect prostate from cancer { June 15 2005 }
Tea may fight ovarian cancer
Toxin in pet food eaten by chickens fed to people { May 4 2007 }
Toxins in the kitchen { May 4 2007 }
Vegetables and soy combats cancer
Vegetarian diet helps man fight cancer { June 7 2007 }
Vitamins tied to prostate cancer
Western asians higher cancer than eastern { June 1 2001 }
White wine increase risk of cancer
Women double risk for lung cancer { December 2 2003 }
Women plagued by lung cancer

Files Listed: 78



Correction/submissions

CIA FOIA Archive

National Security
Archives
Support one-state solution for Israel and Palestine Tea Party bumper stickers JFK for Dummies, The Assassination made simple