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The primary factor in avoiding H. pylori infection is to practice proper hygiene and good hand washing. You should wash your hands, especially after using the restroom, or before handling food. Wash your hands in the following manner: Use warm water ( 120 degrees) and 3-5 cc (roughly a teaspoon) of liquid soap. The soap does not have to be antibacterial. Wash for a total of 15-30 seconds. Eat a diet containing adequate proportions of carbohydrates, fats, proteins, vitamins, minerals and water. This will help you maintain good health. Having a strong immune system can reduce the risk of infection with many bacteria.  Exact proportions vary based on weight,gender activity level, etc. But, caloric intake should be approximately 2000 calories per day, as a broad approximation. Get the majority of calories from fresh fruit and vegetables, legumes and grains, and low fat proteins. Even with a balanced diet, 67% of dieticians recommend dietary supplements. These supplements fill nutritional gaps that are not satisfied by food alone. Vitamin C in particular is important for a healthy immune system. Many physicians recommend about 500 mg per day.  Be aware that vitamin C is acidic and can irritate the stomach. It's a good idea to take a buffered form of the vitamin or try to get it through foods. Good choices include cantaloupe, cabbage, citrus fruits, and red pepper.  Because of its acidity, its a good idea to talk to your doctor about Vitamin C supplements you take if you are receiving treatment for H. pylori. Studies suggest H. pylori may be transmitted via saliva. If you know someone who has H. pylori, avoid saliva contact with them until it is confirmed that their treatment was successful. For example, if your spouse has H. pylori, avoid kissing him or her, and do not share a  toothbrush. Especially when traveling to countries with poor sanitation, be careful about what you eat or drink.  Consider drinking bottled water when visiting countries with poor water sanitation. Refrain from eating at any questionable or roadside food trucks, etc. Eat only in restaurants with sanitation standards similar to an American standard of sanitation. Kitchen utensils should be washed in hot water (as warm as you can safely tolerate) with antibacterial soap. Using hand sanitizer can also be helpful in these types of situations. Washing your hands with unclean water can do more harm than good.
Wash your hands frequently. Eat a balanced diet. Take Vitamin C. Avoid saliva contact. Take precautions when traveling abroad.