GLP-1 medications have transformed obesity treatment, helping millions of people lose weight. According to Gallup data that was published last month, 11 percent of U.S. adults were using a GLP-1 for weight loss as of mid-2026, while 15 percent said they had used one at some point, up sharply from 2024. However, experts say the drugs are not magic bullets, and certain habits can undermine progress.
From skipping protein to relying too heavily on the medication, here are nine common habits that could be slowing results. According to King, many patients become vulnerable toward the end of their dosing week. King said one of the most common misconceptions is believing that healthy automatically means weight-loss friendly.
Foods such as nuts, cheese, nut butter and granola can be highly nutritious, but they're also calorie-dense. Tracking food intake can help people identify hidden calorie sources while ensuring meals remain balanced and nutritious. Tim Church, chief medical officer at Wondr Health and a leading obesity researcher, told Newsweek that one of the biggest mistakes he sees is unrealistic expectations.
Weight loss, side effects, energy levels and even where the body sheds fat can vary dramatically from person-to-person. Unlike medications for cholesterol or thyroid conditions, GLP-1s often require ongoing support, particularly at the start. Church said patients benefit from having clinical guidance to manage side effects, as well as long-term support to navigate lifestyle changes.
He also noted that unsupportive family members or friends can act as "saboteurs" by dismissing or undermining someone's efforts. "A community support group can counteract that.” Protein is particularly important while taking GLP-1 medications because reduced appetite often means people consume fewer calories overall. Calories consumed through drinks can quickly add up without creating much fullness.
According to King, sweetened coffees, smoothies and alcoholic beverages may contribute hundreds of calories while providing little satiety. Preserve muscle during the weight-loss phase, then build muscle once the goal weight is reached.” Reduced appetite can cause patients to unintentionally cut back on foods rich in fiber, such as beans, fruits, vegetables and whole grains. "Fiber is one of the first things to disappear when appetite shrinks," King said.
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