What if a simple snack could help you to dodge the flu, sound smarter or amp up your sex life? It makes perfect sense that the food you fill up on affects how you feel and act. So we came up with the best grub to help you get the most of your everyday activities.

At the Gym

Fuel your workout: Eat a banana
When it comes to exercise energy, it's all about carbohydrates. "Working out increases the need for carbohydrates thirty-fold, and bananas provide the carbohydrates and energy for muscles to work hard," says Amy Jamieson-Petonic, RD, health education manager at Cleveland's Fairview Hospital. There is a small amount of stored carbohydrates in the muscles and liver, but it will be exhausted quickly if there is a not backup fuel source. Bananas are perfect tank fillers — they are well-known for their vitamin B and potassium richness, but they're also jam-packed with carbs. In fact, a medium banana has just as many carbohydrates as two slices of whole-wheat bread. On top of providing muscle fuel, bananas help maintain blood glucose levels, Jamieson-Petonic says. So pack one in your gym bag and peel it about 30 to 60 minutes before your workout.

Heal your muscles: Drink chocolate milk
During your workout you burned through your carbohydrate stores and broke down your muscle, so make sure that you get a combination of protein and carbohydrates post-exercise — both are very important for healing microscopic tears in the muscles, says Jamieson-Petonic. You need to heal these tiny tears to prepare for your next workout, and protein helps to build the muscle back again. Chug a cup of low-fat chocolate milk: It has about 26 grams of carbohydrates and 8 grams of protein, plus it provides the amino acid leucine, which also helps to build and repair muscle tissue. For rapid recovery, have a cup within 30 minutes of completing your workout.

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At the Bar

Prepare for a long night out: Eat french fries
Pre-hangover, some of the best foods to consume are those heavy in fat and carbohydrates, such as a large basket of french fries. Putting anything in your stomach before drinking is a good idea, but fatty foods coat the stomach lining longer and therefore slow down the absorption of alcohol into the bloodstream, which means you're less likely to get tanked, and less likely to feel the queasy aftereffects in the morning. If you're looking to dodge a beer belly (and clogged arteries!), go for a slice of whole-grain toast with almond butter: This will absorb the booze and line the stomach in the same way as fries, without making your tube top too tight. At the bar, go for a caffeine-free mixer — caffeine increases the amount of alcohol you absorb and will probably lead to a heavier hangover in the morning.

Head off a hangover: Drink Emergen-C
After your night of one-too-many glasses of wine, pour a packet of Emergen-C into six ounces of water ($10 for a pack of 36 at GNC.com) and down it before bed. This fizzy drink has 1,000 milligrams of Vitamin C, 28 different mineral electrolytes and lots of B vitamins to help replenish the mineral reserves you lost during the night, and the water rehydrates what the alcohol stripped from your body, which means less of a headache in the morning. If you prefer to pop a pill, take vitamin B1 (about 500 milligrams) and vitamin C (about 1,000 milligrams) with a tall glass of water to help restore your energy level. And when the hangover hunger strikes, dodge the burnt toast and Bloody Mary, and order the eggs — they contain large amounts of cysteine, the substance that breaks down the hangover-causing toxin acetaldehyde in the liver.