Winter can be tough on your mental and physical health. Fortunately, there are numerous foods that may help to improve everything from your mood to your sleep. Here are five foods to keep in your home this winter.

1. Mushrooms

Mushrooms are a great source of vitamin D. Even if it is a sunny winter, Northerners who live above a 35 latitude mark (pretty much a line from NYC to Boulder, Colorado) most likely won't get enough vitamin D — which is crucial for bone health — because the sun stays lower in the sky. If you're not a fan of mushrooms, there are other foods that can help increase vitamin D levels like salmon and vitamin D-fortified orange juice, cow, and plant milks.

2. Tempeh

Foods like tempeh, kombucha, sauerkraut, yogurt, and pickled vegetables are good sources of probiotics, which can help to support your immune system during the tough winter months. Studies have shown that there could be "promise" when it comes to the health benefits and efficacy of probiotics on immune health.

3. Tart Cherry Juice

Tart cherries are naturally rich in melatonin, a hormone that affects sleep. Research has shown that drinking tart cherry juice was "beneficial in improving sleep duration."

In addition to improving sleep, which is the key to staying healthy all winter long, tart cherry juice has been found to reduce pain and muscle soreness and is popular with athletes and distance runners.

Here's a Dr. Oz-approved tart cherry juice mocktail for your next party.

4. Brazil Nuts

Brazil nuts are rich in selenium, a trace element that has been linked to enhancing immune function. They've also been linked to improved heart health and thyroid function, but more research is needed. Despite a slew of health benefits, be sure to limit your daily intake to only a few of these nuts: Too much selenium can lead to a rare, but dangerous life-threatening condition.

5. Veggie Soup

Chef Nikki Dinki, author of "More Veggies Please!: Easy Kid-Approved Meals and Family-Friendly Comfort Foods with Surprising Veggie Twists," created this "flu-fighting" Broccoli Cheddar Soup packed with veggies to keep you satiated and healthy this winter. It's made with a whole head of broccoli, zucchini, and carrots to support your immunity all season long.

Pro tip: Make in big batches and freeze to have on hand.

Is This the Key to Ultimate Hydration?

See how electrolytes work in your body.

Is This the Key to Ultimate Hydration?

Whether you're trying to stay hydrated for your workout routine or rehabilitation, recovery and hydration is so important to keeping your body performing like it should. So how do you make sure that happens? You need electrolytes — the minerals that give electrical power to your body. What the video below to see how they get to work inside your body and how you seamlessly add them to your day.

Presented by USANA.