October is Breast Cancer Awareness month. You wear pink, self-check, and get your annual mammogram, but none of these actions actually protect your breasts.
We know there are foods to protect against cancer... but what about not eating? Early research suggests that intermittent fasting (sometimes referred to as interval fasting, or IF), a cycle between periods of eating and fasting, might help and possibly even prevent it from coming back if you’ve already been treated. The jury is still out on the effectiveness of IF, but it's an interesting subject for further study.
However, we want to start by saying that caution is advised: please talk with your doctor or nutritionist to determine if intermittent fasting is safe for you.
If you have safety concerns, a Gennev menopause-certified gynecologist can give you a trusted opinion, and determine if fasting is right for you. Book an appointment with a doctor here.
Fasting, abstaining from food, is nothing new for many of us.
Maybe you’ve fasted for religious reasons. Whether you’re Muslim, Catholic, Jewish, Buddhist, Hindu, or another faith, most religions embrace fasting as a way to spiritually cleanse and purify.
Or perhaps you’ve fasted for a medical procedure, like that colonoscopy you’ve been putting off.
We’ve written about intermittent fasting during menopause on the Gennev blog before, and it may be easier than you think—without the stress of holidays or gut-clearing laxatives.
According to the National Institute of Health, 1 in 8 U.S. women will be diagnosed with a form of breast cancer at some point in their lives. Breast cancer in women represents 15.2% of all new cancer diagnoses, period.
Aging increases cancer risk overall. Your likelihood of breast cancer goes up sharply in your early 40s and into menopause, with peak risk during your 60s and 70s. Black women see even higher breast cancer occurrences than white women once they enter their late 50s.
More research needs to be done to determine if fasting works to reduce risk, but at this point, it appears it may have to do with blood sugar and circadian rhythm.
Researchers followed the eating habits of more than 2400 women with early-stage invasive breast cancer over a 12-year period; the study did not include women with diabetes.
Women who fasted for fewer than 13 hours each night were 36% more likely to have their cancer return than the women who fasted more than 13 hours, though mortality rates remained the same for both groups.
The longer the women fasted overnight, the more benefits they saw.
Regardless of the duration of fast, eating after 8 p.m. was associated with a significant increase in BMI and inflammation, both risk factors for cancer.
For many women, fasting decreases the overall calories consumed, which improves weight and inflammation.
However, even people who do not decrease calorie consumption through fasting see a difference in glucose metabolism: fasting causes an increase in insulin sensitivity.
The drop in estrogen in our bodies during menopause leads to a decrease in insulin effectiveness.
When you eat, your digestive tract breaks down carbohydrates into sugar (glucose) and releases it into your blood.
Your cells need insulin, a hormone produced in the pancreas, to bring in glucose from the bloodstream to use as energy. Whatever glucose isn’t used is stored as fat.
Between meals, insulin levels drop and your body releases sugar stored in fat cells as energy. When fasting, your body is able to sustain low levels of insulin and blood sugar long enough to burn fat.
If your insulin isn’t working the way it should, your cells can’t bring in glucose, so this glucose turns into fat or stays in your bloodstream. For example, people with type 2 diabetes can make insulin, but their bodies can’t utilize it properly.
Women who have been diagnosed with type 2 diabetes have a 23% higher incidence of breast cancer compared to women without diabetes, and scientists are starting to understand why: there may be a link between breast cancer and hyperglycemia (high blood sugar) and insulin resistance (ineffective use of insulin).
Intermittent fasting may help you get around the increase in insulin resistance (and thus increased blood sugar) that comes with aging to protect your breasts.
Night shift workers may have an increased incidence of breast cancer because their activities are out of sync with their circadian rhythm. If you’ve ever worked nights, you know how difficult it can be to eat or go to work when your body is sending signals for sleep.
Nighttime eating has long been associated with obesity and diabetes, and it may be about more than just insulin: eating late at night can give you insomnia or disrupt your sleep, too.
Did you know there’s a link between quality of sleep and breast cancer?
By avoiding food after 8 p.m. you send your body the right signals.
Finally, fasting ramps up our body into protection mode, which may have benefits for women undergoing chemotherapy for breast cancer. Even better, scientists theorize that fasting does not have the same protective impact on cancer cells, which makes them more vulnerable to treatment.
Again, it hasn't been definitively proven that intermittent fasting is effective, so especially if you're undergoing treatment, check with your doctor before changing your diet.
More research still needs to be done on the long-term benefits of fasting but following a healthy intermittent fasting schedule won’t hurt you.
While there are all sorts of trendy fasts out there for weight loss, doctors at UCSF recommend two methods for cancer prevention.
Eat during a specific window. Known as restricted nighttime feeding, 16:8 fasting, or the Leangains protocol, limiting your food intake to a specific 8- to 12-hour window during the day and fasting overnight is the most approachable type of intermittent fast for most people. Aim for at least 13 hours of fasting.
This can be as easy as eating dinner before 8 p.m. and skipping breakfast. You’re allowed to drink black coffee, tea, water, and other non-caloric beverages during the fasting period.
Alternate day fasting. This is exactly what it sounds like: you eat normally every other day and fast on the alternate. Most sources recommend consuming around 25% of your usual calories on the fasting day. The drawback: eating every other day is unsustainable long-term for most of us.
No matter which fasting plan you explore, the following tips can help keep you satiated—and sane:
Intermittent fasting is not for everyone, and if you fall into one of the following groups, you should avoid fasting or approach it with caution and medical oversight.
More research still needs to be done on the benefits of intermittent fasting, but these breast best practices (say that ten times fast) will always help.
Have you tried intermittent fasting? We want to hear from you! Share your experience or tips in the comments below or join the conversation in the Gennev community forums.
A seasoned communicator with a master's degree in digital media to back it all up, Helen Pitlick loves to create content that helps women feel more confident at all stages of their lives. When she's not in front of her laptop, Helen enjoys pottery, pretending to play soccer, and hanging out with her dog.
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