For example, when it comes to hormones, ghrelin makes you hungry, leptin and other hormones keep you feeling full, Nadolsky says. Thyroid, cortisol, insulin, testosterone, and estrogen all influence how you metabolize and store energy. Meanwhile, genetics have a large influence on both basal metabolic rate (how many calories you burn just to live) and hormone health. While all of these things are impacted by our diet, they’re not only controlled by the way we eat. And, in fact, while sleep, stress management, and, when needed, medication can help regulate other hormone levels such as estrogen and thyroid, our hormones and other physiological processes are often out of our control. And by the way, being able to impact our hormone levels and metabolism with our diet doesn’t always work out in favor of weight loss. As a 2016 review notes, one of the reasons weight loss by way of caloric restriction isn’t efficacious is because “this strategy is countered by the body’s natural physiological response to negative energy balance.” In other words: The body fights back against caloric restriction.
Worried about hunger? There are a lot of simple tactics you can use to curb your appetite. Drink caffeine in the morning to kill your appetite until lunch, eat a lot of vegetables and protein, drink a lot of water, and make sure to have your sugar water at night. The first few days can be tough, but the hunger goes away a lot faster than you’d think.
If you’ve heard it once, you’ve heard it a million times: Abs are made in the kitchen. Unfortunately, if you regularly eat ultra-processed foods (think chips, store-bought baked goods, and candy), you won’t be able to see yours. “These foods are produced using sweeteners like high fructose corn syrup, which in high amounts has been shown to promote visceral fat accumulation in the liver, leading to weight gain, inflammation, and related diseases,” explains Rachel Fine, RD, owner of To The Pointe Nutrition.