If you’re one of the two billion people in the world who are over-weight or obese, or the one billion people with fatty liver disease, your doctor’s first advice is to cut calories—and especially to cut down on concentrated sugars such as high-fructose corn syrup, a sugar found in sweetened beverages and many other processed foods.

Researchers have demonstrated for the first time that black tea may promote weight loss and other health benefits by changing bacteria in the gut. In a study of mice, the scientists showed that black tea alters energy metabolism in the liver by changing gut metabolites.

Packed with nutrients linked to better health, walnuts are also thought to discourage overeating by promoting feelings of fullness. Now, in a new brain imaging study, researchers at Beth Israel Deaconess Medical Center (BIDMC) have demonstrated that consuming walnuts activates an area in the brain associated with regulating hunger and cravings. The findings, published online in the journal Diabetes, Obesity and Metabolism, reveal for the first time the neurocognitive impact these nuts have on the brain.

What determines how children decide to spend their cash on snacks? A new study shows that children’s experience with money and their liking of brands influenced purchase decisions – and that for some children, higher prices for unhealthy snacks might motivate healthier choices. The study is published in the journal Appetite.

According to the National Onion Association (yes, that’s a thing), approximately 170 countries grow onions, and it’s estimated that 9.2 million acres of onions are harvested annually around the world. Onions are low in calories and packed with vitamins, minerals and antioxidants. They also go great in your salads, omelets and guacamole recipes.

Despite the recent spike in interest of clean-label and free-from foods, the food industry remains driven by convenience, according to Food Technology magazine contributing editor A. Elizabeth Sloan.