How Can I Beat Back a Blue Mood This Winter?

Cold and dark days make it common to feel a dip in serotonin levels. Omega-3 fatty acids, found in oily fish (such as salmon and sardines), have been shown to improve cognitive function. Lentils, meanwhile, are a rich source of the amino acid tryptophan, a precursor to serotonin.

What Foods Should I Eat to Up My Immunity?

Citrus is bursting with vitamin C, and your body absorbs extra cold-fighting antioxidants from the combo of pink grapefruit, which also contains the phytochemical lycopene.

I Have a Sore Throat and Feel a Cold Coming On. Help!

Indoor air breeds colds and coughs, but common-sense therapies -- like eating fruits and veggies and scrubbing hands clean -- are still the most effective way to keep germs at bay this winter.

Studies have shown that green tea (steeped 3 to 5 minutes) is the best food source of catechins, plant compounds that halt oxidative damage to cells. Flavor it with fresh, anti-inflammatory ginger and pomegranate for an extra nutrient punch.

Natural Winter Remedies: Licorice

Licorice (Glycyrrhiza glabra) has immune-boosting and throat-soothing properties that make it an excellent addition to cough and cold formulas.

How to use: For coughs, make a tea that combines mullein leaf with a pinch of licorice. Safety note: People who have high blood pressure should avoid this herb or use the deglycyrrhizinated form (look for "DGL" on packaging).

Natural Winter Remedies: Sage

Common culinary sage (Salvia officinalis) can help to ease sore throats and dry up sinuses.

How to use: For a sore throat, make a strong tea by pouring 4 ounces of water over 2 teaspoons of dried or fresh sage. Cool to room temperature. Gargle until the mixture is gone. Repeat three times daily. For drippy sinuses, drink a cup of regular-strength sage tea.

Natural Winter Remedies: Yin Chiao

This centuries-old Chinese formula stars a number of immune-boosting herbs and can help ease cold symptoms such as sneezing and congestion.

How to use: Use at the first sign of illness; follow package directions or consult with a TCM practitioner.