Lifestyle habits can have some impact on the signals that tell one’s body whether it is hungry or full. But hunger isn’t random, because hormones play an important role. Every day, the stomach, intestines, fat tissue, and brain talk to each other through a network of powerful chemical messengers. These messengers, called appetite-regulating hormones, shape the feeling of hunger, how satiated one feels after eating, and how the body balances energy (calories in versus calories out). A hormone called ghrelin rises before meals to stimulate hunger, while hormones such as glucagon-like peptide-1 (GLP-1), peptide YY (PYY), and cholecystokinin (CCK) rise after eating to promote fullness and slow digestion. The hormone leptin, which is made by fat cells, helps regulate long-term energy balance. When these hormones function smoothly, the body can maintain a steady rhythm of hunger and satiety.
Lifestyle Habits: Sleep, stress, diet, and physical activity all influence appetite hormones. Lack of sleep increases ghrelin and lowers leptin, making people feel hungrier. Stress alters the gut-brain communication pathways, often driving cravings for high-calorie foods. A healthy diet that includes plenty of fiber-rich plant foods (vegetables, fruit, whole grains, beans/lentils, and nuts/seeds) is helpful in controlling hunger. In this case, fiber plays an important role because it slows digestion, steadies hunger cues, and, most importantly, feeds the gut microbiome. There is a growing understanding of the role microorganisms (microbiome) that live in the intestines play in appetite regulation. Studies show that these bacteria ferment some fiber into molecules called short-chain fatty acids (SCFAs), which are powerful signaling molecules that help regulate appetite pathways. SCFAs can influence both the bowels and brain, affecting hunger and fullness. This helps explain why diets rich in whole and minimally processed foods that are naturally high in fiber tend to support more stable appetite patterns in comparison with diets high in ultra processed foods (which tend to be low in fiber).
Studies show programs combining healthy eating with regular physical activity can improve hunger-related hormones. In one lifestyle trial, participants who followed a 12-week program of calorie restriction plus aerobic physical activity had lower ghrelin and higher GLP-1 and PYY concentrations, supporting better satiety.
Impact of Weight Loss: Appetite hormones shift when a person loses weight. A large, pooled analysis found that weight loss increases the hunger hormone ghrelin and may temporarily lower fullness hormones like PYY and GLP-1. These changes reflect the body’s attempt to return to its previous weight. But weight regain is not inevitable. Hormones are only one part of the larger picture. Consistent habits and a healthy eating pattern can help people stay in control even as hormones shift.
GLP-1 DRUGS
GLP-1 hormones help control appetite, slowing stomach emptying so you feel full, and signaling the brain to curb hunger. The drugs commonly called “GLP-1s” like semaglutide (Wegovy, Ozempic, and Rybelsus) are GIP-1 receptor agonists—meaning they mimic GLP-1 hormones, essentially making the body think it is getting a “full” signal. GLP-1 drugs improve diabetes control and can drive major weight loss. One landmark study found that, after 68 weeks, people on semaglutide lost about 15 percent of their body weight while those on the placebo only lost about two percent. And research suggests they may have other beneficial health effects as well: in the SELECT trial (involving people with overweight/obesity and established cardiovascular disease, but no diabetes), semaglutide lowered major cardiovascular events (like heart attack and stroke) by about 20 percent. In the FLOW study (in which participants had type 2 diabetes with chronic kidney disease), it reduced major kidney problems by 24 percent. Whether these health effects are due solely to weight loss or to some combination of weight loss and yet to be identified drug mechanisms is not yet determined.
GENERAL RECOMMENDATIONS
BUILD YOUR MEALS AROUND FIBER. Naturally fiber-rich plant foods are filling, and they support a healthy gut microbiome, which influences appetite hormones.
AIM FOR REGULAR MEALS. Consistent eating patterns help regulate ghrelin and prevent intense hunger later in the day.
PRIORITIZE SLEEP AND MANAGE STRESS. Poor sleep and high stress levels raise ghrelin and lower leptin, increasing appetite.
FOCUS ON SUSTAINABLE HABITS. Hormone changes after weight loss can be managed with a consistent healthy diet that doesn’t exceed one’s calorie needs, regular physical activity, and other lifestyle practices. Where the temporary use of GLP-1 drugs will be of use, has yet to be determined.
Below is a link to obtain my books available for purchase (digital or print versions):
Website: https://radiantmortontavel.com/
To be placed on the mailing list for future blogs, contact: tavelmorton@gmail.com