Here are ten tips from The Council of Maharishi Ayurveda Physicians, for a balanced prostate:

1. Drink lots of water throughout the day, in between meals. This will keep the urine from becoming too concentrated. If you add some herbs to the water, it will flush out toxins, dissolve ama in the blood tissue and help purify the urine. Here's a recipe: Boil two quarts of water and put the water in a thermos flask. Add three leaves of holy basil, 1/3 t. fennel seed, 1/4 t. coriander seed, and six white pumpkin seeds or six fresh cucumber seeds. Keep drinking this water throughout the day, but stop drinking it after 7: 00 p.m.. Stay away from fluids at night if you have a prostate problem, as a full bladder at night can cause pressure on the prostate and disturb your sleep with the need to get up frequently to urinate.
2. Each time you urinate, take the necessary time to empty your bladder completely. Because the urethra (the passageway through which the urine drains from the body) is already narrow, when there is some enlargement of the prostate, the urinary channel becomes even narrower. If you are in too much of a hurry, all of the urine might not be drained from the bladder. This is not a good thing, because the urine becomes more concentrated if it is not drained from the bladder each time you urinate. So take the time to empty the bladder completely.
3. Avoid drinking alcohol, because it creates imbalances in the blood tissue, as does caffeine. Both of these create abnormal urine production and irritate the bladder as well.
4. If you have to sit all day at your job, take short breaks frequently and try to stretch or take a short walk. This will restore the normal flow of energy, blood, and nutrient fluid to the prostate area.
5. When the weather is cold, take care to keep your head, neck, and body warm. If your body temperature drops, it leads to urine retention, which aggravates the prostate. So keep your body temperature in a moderate range.
6. Make sure that your bowel movements are regular. Constipation creates an obstruction in Apana Vata, in turn creating pressure on the prostate, increasing ama in the blood tissues, and creating excessive dryness in the whole area. To help with regular elimination, try having a stewed apple in the morning for breakfast with stewed figs, raisins, or prunes. You can also add more fiber and cooked vegetables to your diet, and have 2-4 teaspoons of psyllium seed husk with warm milk or water at night before going to bed. If these measures don't work, take 2-4 Herbal Cleanse tablets before bed with water.
7. Daily abhyanga or oil massage pacifies Apana Vata, and that is always good. Massage the hands and feet, in particular, as an effective preventative. Use Rejuvenation Oil for Men, which contains herbs and oils to rejuvenate the male physiology.
8. If you are having trouble sleeping at night, be sure to correct the underlying imbalance. If you are not able to fall asleep, take Blissful Sleep I for Vata imbalance that causes this problem. If you wake up between 2: 00 and 4: 00 a.m. with lots of energy, this is a Pitta imbalance, and Blissful Sleep II can help.
9. Eat foods that are tri-doshic, which means that they pacify all three doshas. These include soaked walnuts and soaked almonds. Avoid foods that aggravate any one of the doshas: food that is too dry, too oily, too greasy, too cold or too hot, too spicy or not spicy enough. Avoid extremes.
10. Include lots of sweet, juicy fruits in your diet, as these help nourish the Rasa Dhatu (the nutrient fluid), purify the urine and help maintain a healthy flow of urine. They also create ojas, improving immunity and enhancing cellular intelligence. If stewed or cooked until they are soft, they are not only pacifying to Apana Vata, but also to Pitta dosha. They make an ideal breakfast when combined with prunes, figs, and raisins. If you have a Kapha imbalance, you can eat sweet, juicy fruits raw, but even then you should avoid eating raw fruit after sunset, as the digestion is not as strong after the sun goes down. 

http://www.mapi.com/ayurveda_health_care/self_care/prostate.html