Exercising at a younger age helps prevent breast cancer

In 2007, a study was published showing that women 20-69 years old who reported doing 6 or more hours per week of strenuous exercise had a 23% reduced risk of invasive breast cancer compared to sedentary women,

A recent study has just shown that women between the ages of 12 and 35 who exercise regularly are 23% less likely to get breast cancer before menopause than less active women. The women with the lowest risk reported either running 3.25 hours a week OR walking 13 hours a week.

A quarter of all breast cancer cases are diagnosed before menopause.

This new study is the largest study so far on pre-menopausal breast cancer. 65 000 women completed questionnaires on their level of physical activity at various periods of their lives, starting from age 12. The researchers followed up over six years and found that 550 women had been diagnosed with breast cancer.

The researchers concluded that the benefits of exercise weren’t linked to a particular sport or intensity, but to the total activity.

Both this study and the 2007 one speculate that women who are more active have a lower breast cancer risk because they tend to menstruate later in life and are therefore exposed to less estrogen. Women exposed to more estrogen have a greater breast cancer risk.

Bottom line: it’s important for girls to start being more physically active early on- in their teens and early adulthood- to help reduce their risk of developing breast cancer. Of course, being more physically active can also help prevent obesity and it’s complications- type 2 diabetes, heart disease, high blood pressure.

Sources:

http://www.theglobeandmail.com/servlet/story/RTGAM.20080514.wlcancer14/BNStory/lifeMain , http://www.cbc.ca/health/story/2007/02/16/breast-cancer-exercise.html , http://ap.google.com/article/ALeqM5gQwQoRDjVs27bJQ6x2mvef_wEVCwD90KVP400

Psychological stress associated with overeating

Dr. Mark Wilson and his team at Emory University recently published their study that sought to observe the relationship between diet and exposure to psychologically stressful environments.

Female rhesus macaques (rhesus monkeys) organize themselves and maintain group stability through continual harassment and threat of aggression. Obviously, this situation is an important source of chronic stress for the monkeys that are the recipients of this aggression.

The researchers looked at the feeding patterns of the aggressive, dominant monkeys compared to the socially subordinate monkeys and found that the dominant females ate significantly less food than the subordinate monkeys. As a result, the stressed-out subordinate females gained more weight and had a higher level of the stress hormone, cortisol, a hormone that seems to be responsible for abdominal storage of fat. Fat that’s stored around the abdomen is called visceral fat and is more dangerous and associated with an increase risk of heart disease and type 2 diabetes.

This study provides important insight into the psychological basis for the sharp increase in obesity in recent years.

Source:

Emory University (2008, May 14). Psychological Stress Linked To Overeating, Monkey Study Shows. ScienceDaily. Retrieved May 13, 2008, from http://www.sciencedaily.com­ /releases/2008/05/080513125216.htm

http://www.eurekalert.org/pub_releases/2008-05/eu-yrf051308.php

Yale University (2000, November 23). Stress May Cause Excess Abdominal Fat In Otherwise Slender Women, Study Conducted At Yale Shows. ScienceDaily. Retrieved May 14, 2008, from http://www.sciencedaily.com­ /releases/2000/11/001120072314.htm

Square watermelons...of course.

Watermelons are big and round and take up a lot of room in the fridge, right? They’re also difficult to cut because of their shape.

To solve this problem, innovative Japanese farmers started growing square watermelons in 2001. It’s just more practical- they take up less space!

While the fruit is growing on the vines, they insert the melons into square glass cases.

The square watermelons are expensive though- they sell for 10 000 yen or ~82$. Normal watermelons sell for 15-25$ each in Japan.

Sources:

http://archives.cnn.com/2001/WORLD/asiapcf/east/06/15/square.watermelon/index.html

http://en.wikipedia.org/wiki/Watermelon

What about stevia?

Stevia is a plant that’s in the sunflower family and is native of Paraguay. It’s 300 times sweeter than sugar without the calories.

The people of Paraguay and Brazil use it to make sweet herbal tea and it’s been adopted by Japan that uses it in various products including soy sauce and sweet pickles. It’s also found in their Diet Cokes. Rebiana is the trade name for a patent-pending sweetener developed by the Coca-Cola Company, jointly with Cargill.

Stevia claims to strengthen the immune system, enhance the body’s natural production of vitamins, promote regularity, support liver health, help control the formation of free radicals, nourish the pancreas, be an excellent weight loss aid, help minimize hunger sensations, reduce cravings for sweets and fatty foods, aid in digestion, decrease hypertension, stabilize blood glucose levels, shorten recovery time from cold and flu and aid in addictions to tobacco- wow!

Agriculture Canada is currently growing the plant to determine the feasibility of growing the crop for commercial purposes. Coca Cola also plans to obtain approval for Rebiana as a food additive within the US by 2009.

Good luck since stevia is actually banned in the European Union, Singapore and China. Australia, New Zealand, Canada and the States forbid the use of stevia in foods. In Canada and the States, it can only be sold in health food stores as a dietary supplement (things sold in health food stores don’t have to be approved by Health Canada or the US Food and Drug Administration).

Once upon a time, stevia could be found in foods in the US, like in Celestial Seasonings herbal tea. However, in the early 90s someone tattled to the FDA, pointing out that stevia had not been approved- rumour has it that it was Monsanto (aspartame manufacturer) that blew the whistle...

So why is stevia banned in so many places? There’s lack of proof that it’s safe. The Centre for Science in the Public Interest (CSPI) has placed it in their ‘everyone should avoid’ category. High doses fed to rats reduced sperm production and increased cell proliferation in their testicles, potentially causing infertility. There’s also a possibility that it may be a carcinogen.

The CSPI states that “small amounts are probably safe”. A member of the CSPI pointed out that: “it may be that with further experiments and further research we'll find that stevia would really not be a problem in the amounts that consumers would be consuming but right now the record shows stevia shouldn't be approved yet until there's more research."

I choose to stay away from it... but it’s your choice.

Sources:
Centre for Science in the Public Interest Health Letter. Nutrition Action. “Chemical Cuisine: A guide to food additives. May 2008.
Nestle, Marion. What to Eat. North Point Press. 2006.
http://www.cbc.ca/consumers/market/files/food/stevia/
http://en.wikipedia.org/wiki/Stevia

The saltiest meal in America

In case you missed it, frequent reader of this blog, Mike, posted a link in the comments of my previous sodium blog to a report done by Men's Health Magazine on the 20 saltiest foods in America (thanks Mike!).

I thought it was worth posting some of their entries.

Remember that adults should be aiming for 1500mg sodium a day and not more than 2300mg/day.

Saltiest bread: Dunkin' Donuts Salt Bagel at 4520 mg sodium, 320 calories.

Saltiest Salad: Romano's Macaroni Grill Chicken Florentine at 5460 mg sodium, 840 calories.

Saltiest Kid's Meal: Cosi Kid's Pepperoni Pizza at 6405 mg sodium, 1901 calories. The recommended sodium intake for children over 9 years old is 1500mg and for kids 4-8 years old, it's 1200mg/day.

Saltiest appetizer: Papa John's Cheesesticks with Buffalo Sauce at 6700 mg sodium, 2605 calories.

Saltiest Pizza: Pizza Hut Meat Lovers' Stuffed Crust Pizza ( 3 slices of a 14" pie): 5070 mg sodium, 1560 calories.

Saltiest dessert: Atlanta Bread Company Raspberry Scone at 1750 mg sodium, 360 calories.

And drum roll please…..

Saltiest dish in America: Romano's Macaroni Grill Chicken Portobello at 7300mg sodium, 1020 calories.

http://today.msnbc.msn.com/id/24313369/?pg=1#TDY_MH_saltiestfoods

Everyone should avoid sweeteners...

So, I just received the newest edition of the Centre for Science in the Public Interest’s (CPSI) newsletter, Nutrition Action. They have listed common food additives and their assessment of their safety, categorizing them as Safe, Cut Back, Caution, Certain People Should Avoid and Everyone Should Avoid.

Interestingly, under the category of “Everyone should avoid” are sweeteners: Aspartame, Acesulfame-Potassium and Saccharin.

This is their reasoning:

A new Italian animal study found that long term use of aspartame (marketed as Equal and found in soft drinks ), in amounts similar to that found in the human diet and below the acceptable intake deemed safe by Health Canada and the States, could increase the risk of leukemia, lymphoma and breast cancer.

The CPSI points out that studies done on Acesulfame-Potassium (Acesulfame-K- found in diet soda and foods) in the 70s showed a link between the sweetener and cancer and the US FDA hasn’t required better research since.

They also point out that animal studies have shown that Saccharin (Sweet n’ Low) can cause cancer of the bladder, uterus, ovaries, skin and other organs. A US National Cancer Institute study found that people that ate large amounts of saccharin had higher rates of bladder cancer than people who used smaller amounts. The use of saccharine in foods and drinks is illegal in Canada but Sweet n' Low is sill around.

Sources:

CPSI Nutrition Action Health Letter “Chemical Cuisine: A guide to food additives”. May 2008.
http://www.nytimes.com/2006/02/21/opinion/21tues4.html