First, help him live free from worry. Excessive stress tends to weaken the immune system.

Next, eat health and flavorful foods. I try to eat foods from this list every day...

1. Blueberries Sweet wild blueberries are bursting with antioxidants. Studies show that a
blueberry-rich diet improves memory and motor skills and reverses age-related
declines in balance and coordination.

2. Dark Leafy Greens According to the Human Nutrition Research Center of Aging, “homocysteine has
a toxic effect on arterial walls, and oxidation corrodes the arterial walls.” In
order to break themselves down, homocysteines require folate and B12 or B6,
vitamins found in vegetables like spinnach, collard greens and swiss
chard.

3. Salmon, Sardines, Trout and Herring Fatty fish are full of neuroprotective omega-3 fatty acids.
Higher levels of omega-3 go hand-in-hand with higher levels of serotonin, a
mood-enhancing brain chemical. Because a fish diet aids communication between
nerve cells, studies have shown its positive effect on learning acquisition and
memory performance.

4. Tomatoes They can ward off certain kinds of cancer, prevent macular degeneration and cataracts,
and help maintain mental function as we age. Tomatoes contain lycopene, a
relatively rare member of the carotenoid family, also found in pink grapefruit
and twice as powerful as beta-carotene. Tomatoes also contain the antioxidant
glutathione, which helps boost immune function. And because lycopene is
fat-soluble, eating tomatoes with olive oil can improve
absorption.

5. Red Wine, Grape Juice Drinking red wine in moderation increases longevity. New
research shows that concord grape juice significantly improves short-term memory
and motor skills. Grape juice increases production of the neurotransmitter
dopamine. Concord grape juice has the highest total antioxidant level of any
fruit, vegetable or juice tested.

6. Whole Grains and Brown Rice One thing you can do to improve intake of nutrients is to switch
to brown rice. It’s filled with vitamins and magnesium, which seems to be
important to cognitive health.

7. Cocoa Chang Young Lee, professor of food chemistry at Cornell University, found that the antioxidant
content of two tablespoons of pure cocoa powder is “almost two times stronger
than red wine, two to three times stronger than green tea and four to five times
stronger than that of black tea.” The antioxidants in hot cocoa protect brain
cells from oxidative stress that can lead to Alzheimer’s and other
disorders.

8. Nuts, Notably Almonds and Walnuts Adding to their party-mix appeal, nuts are rich in
antioxidants and have been found to lower blood cholesterol levels. Walnuts are
rich in omega-3s.

9. Olive Oil Olive oil contains the potent antioxidants called polyphenols, Olive oil has been shown to
reduce blood pressure and cholesterol levels. The extra-virgin variety is
best.

10. Garlic This pungent herb fends off aging via its antioxidant properties. It also contains strong
antibacterial and antiviral compounds that help shake off stress-induced colds
and infections. Raw, crushed garlic is best; cooked garlic is less powerful but
still benefits the cardiovascular system.

Honorable
mentions:

Broccoli - lots of vitamin C, carotenoids*, and folic acid
Beans - Inexpensive, low in fat, and rich in protein, iron, folic acid, and fiber.
Cantaloupe - a quarter melon supplies almost as much vitamin A and C as most people need in an entire day.
Fat-free (skim) or low-fat (1% but not 2%) milk - excellent source of calcium, vitamins and protein with little or no
artery-clogging saturated fat and cholesterol.
Oranges - rich in vitamin C, folic acid, and fiber.
Sweet Potatoes - loaded with carotenoids, vitamin C, potassium, and fiber.
100% Whole-Grain Bread - higher in fiber and about a dozen vitamins and minerals than enriched while
bread or "wheat" bread.
Berries: cranberries, cherries, raspberries, and strawberries are all rich in anthocyanins that repair and protect DNA.
Tea: black and green contain powerful compounds shown in studies to lower the risk of several types of cancer.
Pumpkin: a super-rich source of both beta-carotene and alpha-carotene, two hard-working carotenoids that combat lung
and ovarian cancer.
Pineapple: the enzyme bromelain may inhibit the growth of malignant cells in both lung and breast cancer, while the phenolic compounds also provide a protective benefit.
Apple:  one a day help keep cancer at bay. Studies show quercetin may reduce the risk of lung cancer and impede growth of prostate cancer cells. .
Oatmeal: one of the only food sources of GLA, an important fatty acid. Go for the slow cooking kind, not the instant)
Eggs: nature's most complete food and a highly bio-available source of protein. Get the free-range kind which have omega-3 fats, (and don't be afraid of the yolk)
Water: nourishes, replenishes, and is needed for every cellular process in the body.
Lean meat: (Lamb and venison) The iron and B-12 are best absorbed from meat, and it's a
great source of protein. Small portions can absolutely be part of an effective
diet for both weight loss and health).
Carrots: Carrots are loaded with a potent antioxidant called beta-carotene, a member of the healing family of carotenoids. Cooked carrots have considerably higher levels of antioxidants than uncooked.

Clean filtered water is perhaps one of the best things for us I drink nearly a gallon of water every day all summer long, a little less in the winter.

I will keep him and you, in my prayers.

My dad had bladder cancer 15 years ago. he has fully recovered. Bladder cancer is perhaps one of the least difficult cancers to treat. I hope he is doing well.