Prostate cancer

Impact of diet and exercise

There are many ways you can positively influence your health. Lifestyle choices, such as diet, exercise, and smoking or drinking, are influenced by habit, culture, and preferences and are different for each individual. Every day the foods you choose to eat and the amount of physical activity you get can impact your overall health as well as your prostate cancer risk, recovery, and survival.

Physical activity can improve your physical and emotional health. It is important for managing weight, maintaining muscle, reducing your risk of heart disease, and keeping bones strong. Staying active can help with balance, improve your sleep, and reduce fatigue and anxiety. Exercise can also help with potential side effects of prostate cancer treatment.

The link between exercise, prostate cancer and treatment

Studies have found that men who get regular physical activity have a slightly lower risk of prostate cancer. Vigorous activity may have a greater effect, especially on the risk of advanced prostate cancer. Also, in men with prostate cancer, physical activity is associated with better survival, and a modest amount of vigorous activity, about three hours a week, may substantially improve prostate cancer survival.

Many treatments for prostate cancer can have detrimental effects on your body. Hormone therapy can lead to osteoporosis and loss of muscle mass, both of which can be improved through exercise and strength training. Other treatments, such as surgery, can cause urinary incontinence (inability to control urine flow). Kegel exercises before and after prostate cancer treatment strengthen the pelvic-floor muscles, which can improve incontinence.

Any plan for physical activity should fit your personal situation and fitness level. Talk with your medical team before starting any exercise regimen.

Inflammation and oxidization

Hormones and specialized proteins found in body fat contribute to inflammation and oxidation, which in turn contribute to the development and progression of prostate cancer. Using diet and exercise to maintain a healthy weight helps limit your body fat and prevent this inflammation and oxidation. In addition, regular exercise and certain foods (especially fruits and vegetables) have natural anti-inflammatory and antioxidant properties. (Also, eating more fruits and vegetables may help reduce your intake of processed foods.)

Insulin resistance

Excess body fat promotes insulin resistance, a condition in which the body produces insulin but doesn’t use it effectively—leading the body to produce even more insulin. A hormone that helps control blood sugar, insulin is a potent stimulator of prostate cancer growth. By cutting calories and increasing exercise, you may be able to reduce excess body fat, preventing or overcoming insulin resistance and limiting the amount of insulin your body produces. Also, exercising and building muscle mass help control blood sugar, lowering your need for and production of insulin.

Muscle mass and bone health

Normal aging processes and treatments for prostate cancer may result in loss of muscle mass and loss of bone density, possibly leading to osteoporosis. Increased protein intake and exercise are important to maintaining muscle mass (and to maintaining a healthy body weight). Adequate calcium and vitamin D intake as well as exercise can help keep your bones strong.

Diet and exercise recommendations 

A good starting point if you are contemplating diet and exercise changes is the American Institute for Cancer Research (AICR) recommendations. To prevent cancer and to improve long-term survival in cancer survivors, AICR advises people to:

  1. Be as lean as possible without becoming underweight.
  2. Be physically active for at least 30 minutes every day, including activities such as walking, dancing, or participating in sports.
  3. Avoid sugary drinks. Limit consumption of energy-dense foods, particularly processed foods high in added sugar, low in fiber, or high in fat.
  4. Eat a greater variety of vegetables, fruits, whole grains, and legumes.
  5. Limit consumption of red meats (such as beef, pork, and lamb), and avoid processed meats (such as ham, bacon, sausage, hot dogs, and salami).
  6. Limit alcoholic drinks, if you consume them at all, to two per day for men (and one per day for women).
  7. Limit consumption of salty foods.
  8. Don’t rely on supplements to prevent or protect against cancer.

Exercises

Kegel exercises (Strengthening the pelvic-floor muscles)

The pelvic-floor muscles run from your pubic bone at the front of your groin to your tailbone in the back. They sit just under the prostate. Along with serving as a valve to the bladder, they support your bladder, prostate, and rectum in your pelvis. With prostate surgery, some muscle weakness is inevitable due to the proximity of these muscles to the prostate. By starting to strengthen your pelvic muscles before surgery, you can minimize your muscle weakness and also your risk for incontinence.

Your pelvic floor muscles can be engaged by contracting as if you want to stop your urine stream. Think of lifting up your perineum, the area of tissue between the testes and rectum. To tell whether you’re using the right muscles, you can look for a lifting of your penis during the contraction. Avoid bearing down.

Try to isolate the pelvic-floor muscles by not tensing your anus or abdominal muscles. When locating these muscles for the first time, lie down on your back and place your hands on your lower stomach. You should not feel movement under your hands as you tense your pelvic floor.

If you leak more when performing Kegels, you may be doing them incorrectly. A physical therapist may be able to help with and optimize your pelvic-floor strengthening program by providing assessment, observation, and biofeedback.

Before surgery

You can do Kegel exercises while lying down or sitting in a chair, depending on your comfort. Contract your pelvic floor for 10 seconds, followed by a 10-second rest. Repeat this five times. Perform this exercise three times a day until your surgery.

After surgery

After your catheter is removed, talk with your nurse or doctor about when to resume doing Kegel exercises (or when to begin them, if you weren’t doing them before surgery).

  • Start with a gentle contraction (less that 100 percent effort) while lying down. Hold the contraction for three seconds, and then relax for 15 seconds. Do five repetitions, three times a day. Increase the intensity of the contraction each day. Also, increase the contraction time by one second and reduce the relaxation time by one second per day until you reach a 10-second hold and a 10-second rest. Continue doing five repetitions, three times a day.
  • The next step is to perform the exercises while sitting or standing. Repeat the same intervals as above, starting with a five-second hold and 15-second relax and working up to a 10-second hold and 10-second relax.

You should notice a gradual decrease in urine leakage and an increase in your ability to wait longer between times you need to urinate. You should also be able to delay an urge to void for at least 15 minutes and get to the bathroom without leakage. Talk to your doctor if you continue to have difficulty with increased frequency of urination or leakage.

The role of resting metabolic rate in weight maintenance

You can lose extra weight and keep it off by increasing your resting metabolic rate (RMR)—the rate at which your body burns calories when you are resting. Your RMR accounts for 60 to 75 percent of your daily calorie expenditure, so even a small increase in RMR will help burn more calories.

Your RMR is closely linked to the amount of muscle you have. Muscle burns 35 to 50 times more calories than fat. So if you increase your muscle mass with strength training and aerobic exercise, you will raise your RMR. This can prevent weight gain or even help you lose weight.

Strength training

Strength training, also known as resistance exercise, can help you increase your muscle mass and RMR, and it’s also important for maintaining healthy bones and for improving balance, which helps prevent falls.

Types of strength training include weight training, push-ups, and pull-ups. Abdominal crunches (sit-ups) may aggravate leakage that is due to stress incontinence. Talk with your medical team or a physical therapist about the level and types of strength training that are safe for you.

Aerobic training

Aerobic exercise (such as fast walking, dancing, hiking, swimming, running, bicycling, tennis, and cross-country skiing) causes your calorie expenditure to increase during the workout and for a few hours after the workout. By doing aerobic exercise, your body burns calories at your RMR plus the additional calories needed to fuel the aerobic exercise.

In addition to burning calories, aerobic exercises are particularly effective at increasing the body’s natural levels of antioxidants and eliminating inflammatory molecules that drive cancer.

How much exercise?

The health benefits of physical activity are directly related to the amount of activity you get on a regular basis. Generally, the more you are able to do, the better. The intensity matters, too, but physical activity does not need to be vigorous to provide benefits. Physical activity includes not only working out at the gym or playing sports but also engaging in hobbies like bicycling, dancing, and gardening, as well as doing active household chores, climbing stairs, and working at a job that has physical demands.

The American College of Sports Medicine recommends that healthy adults do at least two-and-a-half hours of moderate-intensity aerobic exercise per week; strength training two to three days a week; and exercises for balance, agility, coordination, and flexibility two to three days a week. Ask your medical team about the types of exercises that are right for you, the intensity you should aim for, and how often and how long you should exercise.

Diet and supplements

Eating well is important before, during, and after treatment for prostate cancer. It can help you feel better, have more energy, keep up your strength, and lower your risk of infection. It can also help you prepare for surgery and speed your recovery after cancer treatment, and it may help keep your cancer from coming back.

SCCA offers consultation with a nutritionist for all of our patients undergoing treatment. A nutritionist can recommend food choices to help with treatment side effects (like fatigue, nausea, and changes in sense of smell or taste); discuss diet variations (like plant-based diets, anti-inflammatory diets, and whole-food diets); and work with you on an individualized plan that optimizes your health and addresses specific goals (like bone health, blood-sugar control, and weight loss or gain).

While the exact role of diet in prostate cancer is not clear, researchers have studied several factors, and they continue to look for more specific associations between diet and prostate cancer. Many of the foods thought to lower the risk for and improve survival after prostate cancer are foods of plant origin. Men who eat a lot of red meat or high-fat dairy products and fewer fruits and vegetables appear to have a slightly higher risk of prostate cancer. Some studies have suggested that men who consume a lot of calcium (through food or supplements) may have a higher risk of developing prostate cancer; however, most studies have not found such a link with the levels of calcium found in the average diet, and it's important to note that calcium is known to have other important health benefits.

For optimal health, nutritionists at SCCA recommend eating a mostly plant-based diet and including moderate amounts of foods of animal origin. Some of the many foods and nutrients showing associations with prostate cancer risk and survival are listed below.

Lear More About SCCA Medical Nutrition Therapy Services

Protein

Protein is important to help keep up your strength and rebuild tissues that may be harmed by cancer treatment. The best choices are beans (legumes), nuts, fish, eggs, and chicken without the skin.

Dietary fat

Everyone needs some fat as part of a healthy diet. Fat contains important nutrients, including vitamins A, D, E, and K, and is an important part of the cells in your body.

More research is needed to determine the effect fat has on prostate cancer. In any case, it is probably a good idea to choose healthy fats, limit your intake of saturated fats, and avoid trans fats. Healthy fats, such as monounsaturated and polyunsaturated fats, can lower LDL (“bad”) cholesterol and increase HDL (“good”) cholesterol, while saturated fats and trans fats can increase LDL cholesterol.

We recommend using olive and canola oils and eating avocado and a handful of nuts daily. Limit dairy to one to two servings daily. Limit your intake of red meats and chicken skin. It also is a good idea to eat foods containing omega-3 fatty acids, such as those found in fish, two to three times weekly. The omega-3 fatty acids in fish (EPA and DHA) appear to provide protection against prostate cancer and heart disease.

Increased consumption of omega-6 fatty acids, such as safflower, soybean, and corn oils, has been shown to double the risk of prostate cancer in men with a family history of the disease. In addition, regular consumption of deep-fried foods (once a week or more) is associated with increased risk for prostate cancer, and the effect appears to be slightly stronger for more aggressive forms of the disease.

Fruits and vegetables

Some research studies have found a significant association between eating vegetables—in particular, yellow or orange vegetables and cruciferous vegetables—and a lower risk of prostate cancer.

Fruits and vegetables provide the vitamins, minerals, and fiber that your body needs. Different colored fruits and vegetables contain unique varieties of disease-fighting phytochemicals. Only fruits and vegetables, not pills or supplements, provide all of these nutrients together.

Phytochemicals are natural antioxidants. Antioxidants are substances that may protect your cells against the effects of free radicals. Free radicals can damage cells and play a role in cancer and other diseases.

Try to eat a variety of colors of fruits and vegetables each day. Here are examples of colorful plant foods to work into your diet regularly, along with the phytochemicals they provide.

  • Red: tomato-based foods (tomato sauce, tomato juice, tomato paste, salsa, tomato soup), watermelon, pink grapefruit, papaya, and apricots, which provide lycopene
  • Red/purple: pomegranates, grapes, plums, cherries, and berries, which provide anthocyanins
  • Orange: carrots, sweet potatoes, mangoes, apricots, oranges, and cantaloupes, which provide carotenoids
  • Orange/yellow: oranges, peaches, papaya, and nectarines, which provide cryptoxanthin
  • Yellow/green: spinach, peas, corn, avocado, romaine lettuce, and honeydew melons, which provide lutein and zeaxanthin
  • Green/cruciferous: broccoli, cauliflower, radishes, cabbage, Brussels sprouts, kale, chard, collards, and mustard greens, which provide sulforaphane, isothiocyanates, and indoles
  • White/green: garlic, onions, asparagus, leeks, shallots, and chives, which provide allyl sulfides

In addition, some fruits and vegetables that don’t fit into the color system also have benefits. For example, celery contains salicylic acid, the active ingredient in aspirin, which has anti-inflammatory properties.

Lycopene

Lycopene, from red fruits and vegetables or from supplements, is a phytochemical of particular interest because it may affect antioxidant activity and lower the risk of prostate cancer. Laboratory and preclinical studies show less cancer cell growth in the presence of lycopene; however, clinical studies have had mixed results. Several issues—including prostate cancer stage, genetic risk factors, sources and types of lycopene, other dietary differences, and obesity—may impact whether lycopene helps prevent prostate cancer or is useful in treating prostate cancer.

Fiber

Fiber may bind to toxic compounds and carcinogens in the body; and a high-fiber diet may reduce levels of hormones that are involved in the progression of prostate cancer. Dietary fiber comes from the parts of plants your body can’t digest. There are two types, soluble fiber and insoluble fiber.

Soluble fiber

When eaten regularly as part of a low-fat, low-cholesterol diet, soluble fiber can help lower blood cholesterol. Oats have the highest proportion of soluble fiber of any grain. Foods high in soluble fiber include oat bran, oatmeal, beans (legumes), peas, rice bran, barley, citrus fruits, strawberries, and apples.

Insoluble fiber

Insoluble fiber doesn’t seem to help lower blood cholesterol. However, it’s an important aid in normal bowel function. Foods high in insoluble fiber include whole wheat breads, wheat cereals, wheat bran, rye, rice, barley, most other grains, cabbage, beets, carrots, Brussels sprouts, turnips, cauliflower, and apple peels.

Soy

There is some evidence that soy may help prevent prostate cancer (and more evidence that it can help reduce risk for heart disease). Soy contains phytochemicals called isoflavones, which have antioxidant, antimicrobial, and antifungal properties. Isoflavones are also antiangiogenic (they block formation of new blood vessels that nourish tumors) and may block growth of cancer cells.

Soynuts, edamame, tempeh, tofu, and soy milk are sources of soy. Soy may cause some gastrointestinal upset, such as gas, so if you do not eat soy foods regularly now, it may be better to introduce soy to your diet gradually over several weeks.

Calcium

The role of calcium in prostate cancer is unclear. Too much may increase the risk of prostate cancer (and lead to other harmful side effects), while too little may increase the risk of colon cancer. In a study reported in the Journal of Nutrition in 2007, increased dairy intake cut the risk of smokers developing prostate cancer by about 40 percent.

Since prostate cancer treatment may result in a loss of bone density, it is important to consume adequate calcium and vitamin D to help keep your bones strong. Exercise is also important in preventing bone loss. Your calcium requirements depend on whether or not you are receiving hormone therapy and whether or not you have osteoporosis.

  • If you have had a normal DEXA scan and you are not receiving androgen-deprivation therapy, you need between 1,000 and 1,200 mg of calcium a day.
  • If you have osteoporosis or osteopenia or are receiving androgen-deprivation therapy, you need 1,500 mg of calcium per day.

Calcium is found in many foods, including dark green vegetables, soy products, fish, nuts, and beans (legumes). While dairy products are a good source of calcium, research indicates dairy should be limited for prostate cancer survival and prevention. We recommend eating mostly plant-based sources of calcium and limiting intake of dairy to one to two servings daily.

If you do not consume enough calcium in food, you should take a supplement. Calcium carbonate supplements should be taken with meals for best absorption. Calcium citrate can be taken between or with meals. Avoid consuming more than 2,000 mg of calcium daily from food and supplements.

Vitamin D

Vitamin D helps the body utilize calcium and phosphorus to build bones and teeth. Since prostate cancer treatment may result in loss of bone density, it is important to get enough vitamin D to keep your bones strong. Research has found that men with high levels of vitamin D have a lower risk of developing the more lethal forms of prostate cancer.

With adequate sun exposure, your body can manufacture vitamin D. But as you grow older your ability to manufacture vitamin D declines. Risk factors for developing a vitamin D deficiency are living in a less sunny climate (such as the Pacific Northwest), being obese, being over 60, and not getting adequate dietary vitamin D.

It is best to get vitamin D from food, a multivitamin supplement, or a calcium supplement that includes vitamin D. Food sources of vitamin D are limited and generally include fortified sources, such as milk, soy milk, yogurt, orange juice, and cereal.

To determine how much vitamin D you need to get from your diet and possibly supplements, get a blood test to measure your current vitamin D level. Discuss checking your vitamin D level with your medical team.

Vitamin E and selenium

In a clinical study known as the SELECT trial, researchers studied whether selenium and vitamin E, taken together or alone, could help prevent prostate cancer.

As reported in the 2011 results, men who took vitamin E supplements alone had a 17 percent relative increase in prostate cancer. For this reason, we suggest you avoid taking vitamin E supplements and focus instead on consuming foods rich in vitamin E. These include nuts (such as almonds, hazelnuts, and peanuts), vegetable oils (such as olive and canola), seeds, wheat germ, whole grain products, and spinach and other dark, green leafy vegetables.

As reported in the study’s 2008 and 2011 results, there were more cases of diabetes in men taking only selenium, and men taking selenium alone or in combination with vitamin E were more likely to develop prostate cancer. The findings were not statistically significant and cannot be definitely linked to selenium. However, we recommend against taking selenium supplements. The best source of selenium is food. Foods rich in selenium include Brazil nuts, wheat germ, bran, brown rice, whole wheat bread, barley, onions, garlic, turnips, soybeans, mushrooms, fish, and eggs.

Green tea, coffee and red wine

The health benefits of green tea are thought to come from polyphenols, which include catechins—powerful antioxidants. Laboratory and preclinical studies have shown catechins slow the spread of prostate cancer by blocking the stimulating effect of androgen (male hormones, such as testosterone), and they may block a protein involved in the growth of prostate cancer. Catechins also make prostate cancer cells more susceptible to radiation and hormone therapy.

Coffee consumption has been associated with a lower risk of prostate cancer recurrence and progression. In a study reported by Fred Hutchinson Cancer Research Center in August 2013, men who drank four or more cups of coffee a day experienced a 59 percent reduced risk of prostate cancer recurrence and progression compared with men who drank only one or fewer cups of coffee per week. While more studies are needed to determine the mechanisms for this effect, researchers believe that the phytochemical compounds found in coffee have anti-inflammatory and antioxidant effects and modulate glucose metabolism.

Also, according to a study by researchers at the Hutch, men who drank four or more glasses of red wine per week reduced their risk of prostate cancer by half and had a 60 percent lower incidence of more aggressive types of the disease. This may be due to the anti-inflammatory and antioxidant properties of resveratrol, found in red grape skins, peanuts, and raspberries. Resveratrol is also available as a dietary supplement.

It is important to note that increased consumption of coffee may be harmful for some men, and heavy alcohol use has health risks that are well documented.

Supplements

Most research suggests that food is the best source of nutrients—a balanced diet, including fruits and vegetables, is of greater benefit than taking dietary supplements. Supplements can have both risks and benefits. Some studies indicate taking certain nutrient supplements in high doses may have negative health outcomes. In fact, as a result of a large clinical study known as SELECT, we recommend prostate cancer patients do not take vitamin E or selenium supplements. More information about vitamin E and selenium is included in the section on diet above.

Multivitamins and mineral supplements offer no known health benefits and are generally not needed if you eat a balanced diet. However, if you avoid specific groups of foods, such as meat, milk, cheese, eggs, or fruit, you may need to take a multivitamin or mineral supplement in order to get some of the nutrients these foods supply.

Before starting vitamins or other supplements, consult a nutritionist and your medical team.