One food is the key to happiness, says scientists

Yellow: It's the bright color of smiley faces, sunshine and mac and cheese.

According to a study, that's no coincidence. Recent research from The Happy Egg Company has revealed that yellow foods are actually the key to happiness.

Eating bananas and other yellow food result in increased levels of "happy hormones" -- nearly 70% of people recognized that link in the study.

Related: Best and worst vegetables for you

11 PHOTOS
Best and worst vegetables for you
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Best and worst vegetables for you

Avoid: Potatoes 

Studies show that potatoes are "pure sugar" once they enter your system. According to the Harvard School of Public Health, potatoes are responsible for a surge in blood sugar and insulin --- it has the same effect as a can of Cola or candy. 

Eat sparingly: Squash

Like potatoes, squash is a starch vegetable. 1 cup of butternut squash has 11 grams of carbohydrate and more than 40 calories, but is considered a healthier choice than potatoes. Nutritionists advise patients to be careful when eating squash as it can quickly put you "over your carb limit too quickly". 

Eat Sparingly: Eggplant 

Eggplant should be avoided by patients with digestive issues. Says the author of "Eat Dirt", "They contain alkaloids, which protects them from bugs and molds [when they’re growing in the field]. Unfortunately, these chemicals can trigger digestive issues.” Additionally, they possess high carbohydrate levels. 

Some studies have linked eggplant to inflammation and arthritis. Furthermore, researchers advise patients who are prone to kidney stones to avoid the vegetable.

Eat sparingly: Beets

Beets are known for reducing dementia risk and increasing endurance for athletes. But beets have also been linked to kidney stones and gout because they are high in oxalate. This includes patients with gallbladder problems.

Eat sparingly: Bell peppers

Like eggplants and potatoes, peppers are part of the Nightshade family. Bell peppers are believed to cause a buildup of inflammation in the body. 

Eat more: Tomatoes

Whether you consider it a fruit or vegetable, tomatoes are a great source of nutrients and vitamins. It's an "outstanding" source of Lycopene and antioxidants.

A study found that tomatoes were beneficiary in helping patients suffering from Osteoporosis and is an important food for bone health. 

Eat more: Carrots 

Carrots are known for decreasing your risk of heart attack and stroke. Even better, cooked carrots may provide increased benefits than raw carrots. 

A 10-year study out of the Netherlands revealed that fruits and vegetables with deeper shades of orange and yellow are "most protective" against cardiovascular disease. 

Eat more: Bok Choy

There's a reason ancient Chinese loved this bitter vegetable. It's so good for you! Bok Choy is low in calories but high in nutrients like calcium fiber and zinc. According to WebMD, one cup of bok choy (cooked) equates to more than 100% of the recommended dietary allowance of vitamin A. 

Eat more: Kale

It's still the latest superfoods Kale is low in calories and high in fiber, as well as numerous antioxidants. The vegetable is also known for being heart-healthy and lowering cholesterol. A 12-week study that tested the impact of kale juice on men with high cholesterol found favorable results and lowered their risk of "developing coronary disease". 

Eat more: Asparagus

Sure, it's known to make your pee smell and your kids definitely put up a fight, but asparagus is well known for its amazing health benefits. It's packed with vitamins and minerals, low in calorie and fat. Patients looking to lose weight will find asparagus is one of the most beneficial vegetables. 

It's also been scientifically proven that asparagus cures hangovers. "These results provide evidence of how the biological functions of asparagus can help alleviate alcohol hangover and protect liver cells," said a researcher at the Institute of Medical Science and Jeju National University in Korea.

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Why? Because according to scientists, even from a young age, children are taught to associate the color yellow with joy. Think of children's clothes, toys and even their room decor!

So which foods are the most cheerful?

Omelettes take the (yellow) cake for the most cheerful food, followed by bananas, mac and cheese, poached eggs and pancakes.

Scroll through to see some seriously happy animals:

21 PHOTOS
21 animals that are so happy they can't even stand it
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21 animals that are so happy they can't even stand it
HUSKY FRIENDS 👍 HOWLING FRIENDS 👍 RUNNING FRIENDS 👍
Found these loaves of bread taking a mid day horizontal life pause 😴
tongue rolling: not only is it a special talent, it also creates a funnel that sends treats straight to your tummy.
Peke a Boo!
Happy tongue out Tuesday 😝 #corgi #tongueouttuesday #shades #sunglasses #cool
"Boo! It's not whack-a-mole." ----- Posted another photo on Dada's Facebook. Thanks. #dog #longhaired #chihuahua #girl #happy #face #instagramers
BUB watching a yogurt commercial. #lilbub
I'm so in love with nature. Btw, mommy next time do focus on me. Hur~
snugglypuff 😌💤 #softasbutta
Ginny's home spa day! Ginny likes to treat herself like this for all the hard work she does... although it's worth noting Ginny considers having to move to find a comfy spot to nap in as "hard work". #treatyoself
ooooohhh maaah god theez weather iz amaaaaaayzeeeen! I ♥️ fall! Can we keep it? #ginger #walks #lovingfall #hudsonriver #crazy #overexcited #weird #ilovedthisface #precious #priceless #gin #weird #pomeranian @tquerido
Best friends at their favorite puppy play class 😘🐾 #tbt
Log cabin #chuckit ball fun
Hope everyone is doing great! 😄🐶❤️
Don't screw it up for us @skythequeen .. Mom's in a good mood and I spy steak in our appetizer bowls.
Say Whattt 🐶👅
wish you were here 🌴
好happy啊~ #kikokenxandy #goldenretriever #petstagram #犬バカ部 #寶錢 #retriever #instapets #大錢 #薯女 #いぬ #dog #wanko #amore #goldenstagram #犬 #pet #錢妹妹 #golden #inu #furryfriends #petsagram #イヌ #furry #goldensofinstagram #ilovemydog #doglover #goldens_ofinstagram #instadog
This is my entry for @pitterpatterfurryfeet and the best close up close up contest #BestCloseUpsContest ❤️
Harlow and Indiana are just a couple of ghouls from Salt Lake City, Utah. Harlow likes snow skiing and Indiana likes sightseeing. Do any of you live in their neck of the woods?!
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