By Dr. Asnat Raziel, bariatric surgeon specializing in obesity treatment, metabolic health and healthy longevity; Director of the Multidisciplinary Center for Obesity Treatment, Assia Medical, Assuta Ramat HaChayal, Tel Aviv
Habit change on obesity medication: the drug opens a window of opportunity
Habit change on obesity medication is what turns weight loss into real health. The new obesity drugs reduce hunger, boost satiety and quiet the food noise, those nonstop thoughts about food. As a result, they make significant weight loss possible. But precisely because they work so well, it is worth redefining the goal of treatment. The goal is not just to get lighter. Rather, it is to come out of the process healthy, strong and active, with a good chance of aging well.
The World Health Organization defines obesity as a chronic, relapsing disease. In a guideline it issued in December 2025, it states that GLP-1 treatment should be part of a comprehensive approach: healthy eating, regular physical activity and professional support. I cover it in more detail in my article on the WHO guideline. In addition, the 2026 European consensus statement from EASO, EFAD and ECPO stresses that treatment does not end with a prescription. That is why I suggest thinking of your time on treatment as 12 steps of change.
Step 1: Change the goal, from weight to health
Weight matters, but it is only one measure. The aim is to improve your health as a whole. That includes waist size and belly fat, blood pressure, blood sugar and HbA1c (average blood sugar over the past three months). It also includes blood lipids, fatty liver, fitness, muscle strength, balance, sleep, mood and daily function.
In older age, it is especially important to look beyond BMI. The EASO position statement on obesity in older adults says the focus should be on preserving muscle, function and quality of life, not on weight loss alone. In other words, the new goal is not only weight loss but also health gain.
Step 2: Habit change on obesity medication starts on your plate
One of the gifts of treatment is the relative calm around food. Precisely when hunger fades, it is worth building eating habits that will last. First, gradually shift your menu toward nutrient-rich foods. Think vegetables, fruit, legumes, whole grains, nuts, olive oil, fish and quality protein, in the spirit of the Mediterranean diet. The World Health Organization also recommends a varied diet based on whole foods.
At the same time, cut back on sugary drinks, sweets and refined flour. This is not because they are “forbidden.” Instead, it is because when you eat little, every bite needs to work for your body.
Step 3: Protein becomes the anchor of your diet
During weight loss, you lose fat, but sometimes lean body mass as well. A common mistake, therefore, is eating very little and also too little protein. The joint nutrition advisory from four American organizations stresses adequate nutrition and strength training to protect muscle and bone. You do not need a high-protein diet. It is enough to make sure every main meal has a quality source: fish, eggs, yogurt, chicken, legumes or tofu. If you have kidney disease or are older, adjust the amount with your doctor and dietitian. You can read more in my protein intake guide.
Step 4: Start strength training now
If I had to choose one change that must be part of treatment, it would be strength training. Muscle is an important metabolic tissue, tied to strength, stability and independence. The European consensus also recommends progressive resistance training to preserve lean body mass. Start with two workouts a week, and later move to two or three. You can begin with body weight, resistance bands or machines and increase the load gradually. The medication shrinks fat tissue, while training tells the body what to keep. This is how you preserve muscle during weight loss.
Step 5: Bring movement back into everyday life
A gym workout does not make up for a whole day of sitting. So walk, take the stairs, get up from your chair and go for a stroll after meals. The WHO guidelines on physical activity recommend that adults get 150 to 300 minutes a week of moderate-intensity aerobic activity, along with regular muscle strengthening. For example, you can start with a 30-minute walk on most days of the week. This way, you train your heart, lungs, muscles and brain.
Step 6: Eat less, but avoid undernutrition
A sharp drop in appetite can lead to shortfalls in protein, fiber, vitamins and minerals. The European consensus explicitly recommends tracking diet quality and the risk of deficiencies. Fatigue, weakness, hair loss, dizziness or loss of strength are therefore not “part of slimming down.” Your doctor should check whether you are simply not eating enough or not getting the right nutrients.
Step 7: Take care of your gut, fluids and fiber
Some patients experience constipation, nausea, a feeling of fullness or diarrhea. So build a routine of enough fluids, vegetables, legumes, fruit and whole grains, based on what you tolerate. Managing side effects is not a minor detail. After all, a person who feels well can eat well, exercise and stick with treatment.
Step 8: Sleep becomes part of the prescription
You can take an excellent drug, eat right and exercise, yet still neglect a third of your day. The American Heart Association added sleep to Life’s Essential 8, its eight building blocks of heart health. It recommends 7 to 9 hours a night for adults. In addition, it is important to look into snoring, frequent waking, daytime sleepiness or suspected sleep apnea. Here is a short video on sleep and health, and more on sleep and metabolic health.
Step 9: Habit change on obesity medication includes your relationship with food
The medication reduces biological hunger, but it does not erase years of emotional eating, stress, boredom or family habits. When the food noise fades, a window opens to ask some questions. Why do I eat when I am not hungry? When do I lose control? And what can I do instead? The European consensus recommends psychological screening and integrated support as needed. The goal is to learn to make good choices even when some of the hunger returns.
Step 10: Measure what really matters
It is worth turning your treatment period into a personal health experiment. Beyond weight, track your waist size, blood pressure, blood sugar and lipids, liver and kidney function and body composition. Also track grip strength, rising from a chair, walking speed and aerobic fitness. Sometimes the weight stalls, but your waist shrinks, your strength improves and your blood sugar gets better. That is not a stalled success. That is success.
Step 11: Habit change on obesity medication relies on a supportive environment
Willpower is a limited resource, so change your surroundings too. Keep food at home that fits your goals, prepare ready-to-eat protein ahead of time and schedule workouts in your calendar like an important meeting. In addition, leave your walking shoes by the door, go for walks with your partner and cut down on automatic food orders. The World Health Organization also emphasizes that obesity is a social challenge that requires a healthy environment, not just personal effort.
Step 12: Plan for maintenance from day one
This may be the most important step of all. There is no “end of the diet” when you go back to your old life. Obesity is a chronic disease, so its treatment is long term. Some people will need medication over the long run, while others may be able to change the dose or the strategy. The decision to reduce or stop treatment should be medical and personal. Either way, the goal is to reach maintenance with new assets: muscle, strength, fitness, good nutrition, good sleep and habits that do not depend entirely on the drug. You can read more in my article on maintaining your weight after stopping GLP-1 drugs.
Habit change on obesity medication: the drug is only the beginning
The obesity drug revolution is not just about losing 10, 15 or 20 percent of body weight. The real opportunity is to use this period to rebuild your health. That is why habit change on obesity medication includes good nutrition, muscle, movement, sleep, work on your relationship with food and a supportive environment. Longevity medicine is not a race to add years. Rather, it is an effort to extend the years in which we stay healthy, strong and independent. The drugs can be a powerful tool along the way, but long-term health is something you build around them, day after day.
The information in this article is general and does not replace personal medical advice.
References
WHO issues global guideline on the use of GLP-1 medicines in treating obesity
World Health Organization 2020 guidelines on physical activity and sedentary behaviour
