We all know that eating the wrong thing, or eating too much of it, can cause vomiting. But how we eat food also plays a part in preventing nausea in the first place.  Eat small meals throughout the day instead of a couple big meals at long intervals. Eat slowly and chew your food before you swallow it. Avoid foods that are hard-to-digest, such as dairy, spicy, acidic, fatty, or fried foods.  Eat foods that are cold or at room temperature instead of foods that are warm or hot if you find them distasteful. Giving your body the proper time and adequate position to digest food may help keep you from feeling nauseated in the first place.  Drink liquids (preferably water) in between instead of during meals, and stay on pace to consume between 6 to 8 8-ounce glasses of water per day. Keep your head at least a foot above your feet if you decide to rest or sit down after a meal. Activity may worsen the nausea. Don't overexert yourself or engage in strenuous physical activity if you think it may lead to vomiting.

===
Write a summary of the previous text in Vietnamese:
Ăn cẩn thận, đều đặn và cân đối. Uống đủ nước và nghỉ ngơi đúng cách sau khi ăn.