When the winter is coming, people are often afraid of cold and flu symptoms. Therefore, it is necessary to partly prevent these diseases by reducing stress, washing hands frequently, using hand sanitizer, wearing masks and not contacting with those who get sick.
In addition, doctors suggest that healthful foods can help our immune system stronger and more fully functional. You should follow a right diet to make ease the illness like eating more vegetables and fruits, adding garlic to your meals, drinking fruit juices, yogurt, warm liquid as well as minimizing candy and fastfood.
Eating colorful fruits and vegetable

Brightly colored foods including carrots, sweet potatoes, spinach and dark leaf lettuce contain high levels of antioxidants like Vitamin C and Beta Carotene that help prevent effectively flu or bad cold
Supplementing more garlic to your meals

Adding more garlic or taking garlic supplements to your diet can help stimulate white blood cells and prevent the flu.
Drinking fruit juices and warm liquid

Drinking fruit juice everyday helps maintain the proper PH level in the body, which allows healthy bacteria to fight infection and prevent the flu

Warm tea, especially caffeine-free teas such as chamomile or herb teas will help nourish the body without providing sugar and additives

Hot soups such as chicken noodle or clear broth will help clear airways and congested nasal passages
Eating more yogurt

You should eat yogurt twice a day to strengthen the digestive and immune system as well as prevent flu
Eating mushrooms

Mushrooms contain a group of compounds known as beta-glucans that boost the immune system and help the body fight against foreign invaders such as flu and cold viruses. You should add them to your soups, salad or sautee and make it become a common reating habit
Related links:
Selecting the Right Foods for Good Health
Top 8 Foods for Good Health: Full of Nutrition
Is Junk Food Good For Your Health?
Good Foods For Cold And Flu Preventions