For those traveling over the holidays, www.DietDetective.com has details on the best bets in plane food options, broken down by airline, along with more tips to make your travel healthier.

Another option is to bring your own snacks.

Even if you ate before you left home, you are still going to get hungry. We often underestimate the amount of time a trip can take. A two-hour flight could mean four or five hours of travel.

Here are some ideas for snacks you can bring or buy in the airport:

• Water: Buy it after the security checkpoint to take onboard. Dehydration can cause or exacerbate hunger, jet lag and fatigue.

• Cereal: Kashi, Shredded Wheat or Cheerios. Look for portable, low-calorie choices, under 120 calories per cup. You can also look for cereal in a cup: These are portion controlled at 1.5 ounces, and they're easy to store and easy to use.

• Fruit and salads: Stick with fruits like apples and oranges that can withstand some rough treatment. Grapes or most any other fruit can be carried in a plastic container. Also, they often sell cut-up fruit or salads in the airport. It's a bit more expensive, but at least it's often a healthy alternative to what is served on board.

• Energy bars: Although they tend to be high in calories and fat, they are generally better than a slice of pizza or a candy bar at the airport. Choose Larabars; they have nothing but healthy ingredients.

• Nonfat yogurt: Yogurt is a great portable snack. You can purchase it after you go through security.

• Sandwiches: Pre-cut them into portion-controlled sections so you can pull them out at different times during the trip without making a mess. Chicken, turkey, cold cuts and cheese are all great options for sandwiches on the go.

• Soy chips: Yet another portable, low-cal, high-fiber snack.

• Peel-and-eat tuna and salmon cups: Chicken of the Sea makes these easy-to-open cups that give you a quick protein source. With no draining required, this wild-caught tuna or salmon is perfect for on-the-go lunches and snacks.

• Beef jerky: Especially if you're a low-carb fan, but not if you're watching your sodium.

• Nuts: They're a good source of protein, and they help fend off hunger. Portion them into 1-ounce bags (about 160 calories each).

• Dried or freeze-dried fruit: Eat dried fruit in moderation; it's high in calories.

Make sure to check with the Transportation Security Administration for the latest in-flight rules for carrying on food and water at www.tsa.gov.