In-flight emergencies such as heart attacks and fainting spells strike about one person per 800 to 1,900 flights. But, according to a research conducted by Makoto Matsumura of the Saitama Medical School in Japan, eating a light preflight meal can decrease those risks. Eating and drinking before boarding raises the volume of blood circulating in the body, reducing the chance of fainting episodes and cardiopulmonary emergencies, according to the report.

Increased blood circulation produced by the intake of food and fluid is believed to make up for the inadequate oxygen supply brought about by dehydration, low cabin pressure and humidity, alcohol consumption, anxiety and even prolonged sitting common in air travel.

Remember that hunger is a risk factor for an in-flight emergency. Choose a preflight meal and an electrolyte-rich drink to help your body manage in-flight stress. Snack wisely.

Here are some nutrient- and carbohydrate-rich snack suggestions to keep you going:

• Yogurt and a piece of fruit
• Low-sodium vegetable or fruit juice and whole grain crackers
• A small bagel and low-fat cheese
• Baby carrots or celery sticks dipped in cottage cheese and salsa
• Canned peaches or fruit cocktail and low-sodium pretzels
• Low-fat pudding and a whole grain muffin