Anastasia Karanikolaou in Bathing Suit Says "Lemme Kiss"

It's freezing cold in much of the US, but Kylie Jenner's bestie Anastasia Karanikolaou is soaking up the sun in beautiful Turks and Caicos. Karanikolaou posted a series of envy-inspiring pictures of herself wearing a brown bikini as she enjoyed an outdoor shower. "Lemme kiss," commented singer Olivia O'Brien. How does she stay so fit? Read on to see 5 ways Karanikolaou stays in shape and the photos that prove they work—and to get beach-ready yourself, don't miss these essential 30 Best-Ever Celebrity Bathing Suit Photos!

Karanikolaou starts the day with a homemade iced vanilla latte. "Coffee is rich in polyphenols, plant compounds which may have a protective antioxidant effect," says registered nutritionist Nicola Shubrook. "Organic fresh (beans or ground) coffee is best having a higher antioxidant content, with light or medium roast blends preferable to dark."

Karanikolaou's go-to breakfast is avocado toast, with different toppings such as egg, tomatoes, and feta, depending on her mood. "Avocados have been commended as an example of a nutrient-dense food, with one half of the fruit counting towards your five-a-day," says registered nutritionist Jo Lewin. "Avocados are an excellent source of monounsaturated fat and vitamin E, and are a good source of folate. They also supply more soluble fibre than other fruit and contain a number of useful minerals including iron, copper and potassium.

Karanikolaou loves making her own chicken noodle soup at home. "When cooking bones with joint tissue on them (like necks, knuckles, ribs or the leftover carcass from a roasted chicken) the joint tissue cooks down and dissolves into the broth," Lewin says. "The gelatine, glucosamine and chondroitin contained within are released into the broth, absorbed by our bodies and used to repair and rebuild our own connective tissue while reducing inflammation, helping you to get back on your feet faster after a bout of illness."

Karanikolaou loves spinach-packed spanakopita for a snack. "Spinach, like beetroot, is naturally rich in compounds called nitrates; these may help improve blood flow and pressure by relaxing the blood vessels, reducing arterial stiffness and promoting dilation," Lewin says. "A reduction in blood pressure helps reduce the risk of heart disease and stroke. Studies suggest that nitrate-rich foods, like spinach, may also help heart attack survival."

Karanikolaou enjoys a cheese plate whenever she wants a lighter meal. "There are certain cheeses that can help your gut health," says Alexis Supan, MPH, RD. "Options like cheddar, Parmesan, Gorgonzola and Gouda are all excellent cheeses when it comes to providing us some good bacteria and keeping our gut happy."