These five hubs offer the healthiest grub, according to the Physician’s Committee for Responsible Medicine.

San Francisco International Find healthy Asian fare at Harbor Village Kitchen (Main Hall) or Tomokazu sushi (International Terminal).

Dallas/Fort Worth International Go for the Veggie Veneto sandwich (without dressing) at Frullati (Terminals A, B, C). To burn it off, walk the length of the airport. Pack water.

O’Hare International Get a fiber-loaded salad at Eat-A-Leaf (Terminal 3) or Salad Works (Terminal 1) or guzzle antioxidants at Juiceworks (Terminal 2/3).

Detroit Metropolitan Wayne County You haven’t been? Do visit. Have a Greek salad or garden burger at National Coney Island or a low-cholesterol special at Rio Wrap (both in Concourse A).

Denver International Airport Try the Teriyaki Veggie at Itza Wrap! Itza Bowl! (Concourse B).

The recycled air and unpurified lavatory-sink water increase your risk of picking up a germ on a plane, says Michael Roizen, M.D., a physician and best-selling author who logs more than 100,000 air miles a year.

Strengthen your immune system the week before by avoiding junk foods and stocking up on sleep. Avoid rubbing your eyes during the flight, and bring hand-sanitizing gel.

Above all, drink: “Dehydration decreases the ability of the nasal mucosa in your lungs to fight off germs,” says Roizen. Nix caffeine and alcohol — diuretics will inspire frequent trips to the germ-ridden lavatory. [source: You24]