Exposure to light at night doesn’t just interrupt your chances of a great night’s rest, it may also result in weight gain, according to a new study published in the American Journal of Epidemiology. As crazy as it may seem, study subjects who slept in the darkest rooms were 21 percent less likely to be obese than those sleeping in the lightest rooms. The takeaway here is a simple one: Turn off the TV and toss your nightlight.

While ketchup and BBQ sauce are frequently used to help flavor beef, chicken, and the like, the tasty condiments are no friend to your waistline. Ketchup, for example, typically contains around 19 calories and 4 grams of belly-bloating sugar per tablespoon, and BBQ sauce is just as unhealthy, if not worse. To avoid consuming empty calories and unhealthy added sugar, have condiments such as mustard and sauerkraut on hand. While mustard has been linked to revving your metabolism, fermented sauerkraut will help balance the bacteria in your gut.
“They may be small, but these sweet-tasting fruits contain a hefty amount of actinidin, a natural enzyme unique to kiwifruit that aids in digestion by breaking down protein in the body. Kiwifruit also contains prebiotic fiber, which primes the gut for healthy digestion,” Scritchfield says. “Research indicates that a daily serving of green kiwifruit helps increase bowel movements. So, cut in half, scoop with a spoon, and pop into your mouth like nature’s Tums (SunGold kiwis, with a yellow flesh and tropical taste, offer three times the vitamin C of oranges and as much potassium as a medium banana).”
You can avoid a mindless binge by adding visual traffic lights to your snack. Researchers at the University of Pennsylvania and Cornell University gave one set of students a bowl of uniform yellow chips, while another group had their regular snack layered with differently colored chips. Students who had their snack segmented ate 50 percent less than those with a uniform bowl.

Meatless Monday is more than just an alliteration; it’s an easy way to drop a few pounds. Numerous studies have shown that those who eat the least amount of meat are less likely to be obese, have lower BMIs, and lower body fat levels. Though it’s perfectly fine to eat meat a few times a week, these high-protein foods tend to fill you up before you can work your way over to the veggies, which possess fat-fighting, waist-trimming powers. Try spotlighting just greens and healthy grains in your meals a few times a month.

“Tahini is an oft-forgotten option for nut and seed butters, but it sits front and center in my fridge because it delivers major creaminess to sauces and smoothies and packs a powerful flavor punch,” says Willow Jarosh MS, RD co-owner of C&J Nutrition. “Although some advise against eating the spread because of its high omega 3:6 ratio, the super high intake of omega-6s in the average American’s diet isn’t due to things like tahini—it’s mostly from not eating a variety of fats or consuming the majority of fats from fried foods and packaged snacks. As long as you’re also eating foods rich in omega-3s, your end-of-day ratio should be nothing to worry about. Plus, tahini is loaded with tons of healthy nutrients like copper, which helps maintain anti-inflammatory and antioxidant responses in the body. It also provides six percent of the day’s calcium in just one tablespoon.”

Though it’s hardly realistic to keep people from moving north, there’s evidence to suggest that those living in northern latitudes may need to be a bit more careful about their gut health than the rest of us. A study in the journal Biology Letters  found that living in northern latitudes encourages the growth of Firmicutes microbes, which have been linked to weight gain while decreasing the number of microbes linked with slim body types called Bacteroidetes. Generally speaking, the research showed that the number of Firmicutes increases with latitude and the number of Bacteroidetes decreases with latitude. To help ensure a healthy gut no matter where you reside, make sure your diet includes fermented and probiotic-rich foods, both of which encourage the growth of healthy gut bacteria.
Grocery shopping on an empty stomach is never a good idea because research has shown it inhibits your ability to make smart choices about what you wish to eat. In a study published in JAMA Internal Medicine, researchers found that even short-term fasts can lead people to make more unhealthy food choices, picking a higher quantity of high-calorie foods. Fill up before you shop in an effort to avoid buying foods that won’t help you lose weight.

We’ve already established that friends and family play a key role in motivating you to get in shape and maintain a healthy lifestyle, but it’s also crucial for you to be your own driving force. Luckily, research has shown that doesn’t need to require a tremendous amount of effort. According to a 2015 study in the Journal of Marketing Research , subtle, even subliminal, messages may be more effective at helping us stick to a healthy eating regimen than ongoing, conscious focus. The research showed that people who receive reinforcing notes urging them to eat healthily were more likely to make smarter choices than those who tried to keep their goals top of mind at all times, so grab some Post-Its and start crafting motivational messages!

Simply blasting the air conditioner, cracking a window open, or turning down the heat during the winter may help attack belly fat while we sleep, according to a study published in the journal Cell Press. That’s because colder temperatures subtly enhance the effectiveness of our brown fat stores—fat that keeps you warm by helping you burn through the fat stored in your belly. After participants spent 2 hours per day at 62.6 degrees F for six weeks, their brown fat stores increased.
Believe it or not, weight loss isn’t just about exercising and eating right; research suggests what motivates you to get in shape can play a role in your success. A 2014 study in the journal Body Image looked at 321 college-age women and found that long-term, those who exercised primarily for appearance-based reasons had a harder time sticking to their fitness plans than those who worked out to maintain their health. In other words, stop envying those fit models on Instagram and instead remember that you and your loved ones are the people who really benefit when you slim down.
As far as spices go, saffron is one of the most expensive ones around, but it’s also a substance that preliminary research suggests can contribute to weight loss. According to a study published in the journal Antioxidants  saffron extract may inhibit weight gain in a number of ways similar to how antioxidants function. The research suggests the colorful spice could decrease calorie intake by blocking dietary fat digestion, act as an antioxidant and suppress inflammation, suppress food intake by increasing satiety, and enhance glucose and lipid metabolism. Though scientists aren’t totally sure what makes saffron so weight loss friendly, they suspect it has something to do with crocetin and crocin—two antioxidant-rich compounds found in saffron that give it its distinct color.
It can actually help you cut back on calories. That's because capsaicin, a compound found in jalapeño and cayenne peppers, may (slightly) increase your body's release of stress hormones such as adrenaline, which can speed up your ability to burn calories. What's more, eating hot peppers may help slow you down. You're less likely to wolfed down that plate of spicy spaghetti — and therefore stay more mindful of when you're full. Some great adds besides hot peppers: ginger and turmeric.
Alcohol isn’t exactly a weight loss ally, but using it to flavor meat when you cook it could help you drop a few pounds and stay healthy. According to a study in the Journal of Agricultural and Food Chemistry , if you marinate meat with beer for four hours, you can lower the harmful chemicals it produces when exposed to high heat by up to 68 percent.
While no one food is a magic bullet for weight loss, there are certain foods that can help you achieve your weight-loss goals. Most of the foods included as part of a weight-loss diet have a few things in common: they're high in fiber (which helps keep you feeling fuller longer) and have a low energy density-meaning that you can eat a decent-sized portion without overdoing it on calories. Include the following weight-loss foods as part of a healthy overall diet, and you may find it's easier to achieve your weight-loss goals.