Weight loss programs come with an emphasis on different habits that cause people to be overweight. Some healthy lifestyle change programs put the focus on portion control. Others concentrate more on healthy food choices. Which is more effective?


Which Type of Weight Loss Programs Work Best?


Researchers at Penn State University designed a study to determine what type of healthy weight loss programs are the most effective. They discovered that even after going through a training program designed to help people control portion sizes, participants still ate larger portions. But, they chose healthier foods, lowering their calorie intake.

People are often told that eating everything in moderation can help them lose weight, but this study demonstrates that it is better to choose healthier foods than to try to eat less.

In a recent study, researchers measured how much participants ate when given meals that varied in portion size. Despite about one-third of participants having been trained in different strategies to manage food portions during a previous year-long weight loss trial, all participants ate more as portion sizes grew. Although the trained participants ate the same amount as the others, they tended to choose healthier foods and ended up consuming fewer calories overall.

According to Faris Zuraikat, a graduate student involved in the research: “The results show that choosing healthy, lower-calorie-dense foods was more effective and more sustainable than just trying to resist large portions of higher calorie options. If you choose high-calorie-dense foods but restrict the amount that you’re eating, portions will be too small, and you’re likely to get hungry.”

Previous research has shown the power of the “portion size effect,” which is the tendency for people to eat more when larger portions are served and can result in people consuming more calories than they intended.


How the Study on Weight Loss Programs was Designed

• The researchers gathered a group of subjects who had extensive training on portion-control strategies to see if their response to increasing portion size of foods served at a meal differed from untrained individuals.

• The researchers were also interested in whether those untrained individuals with overweight and obesity or normal weight differed in their response.

• Three groups of women were recruited to participate in the study: 34 controls with overweight, 29 controls with normal weight, and 39 who had previously completed a one-year weight loss trial emphasizing portion-control strategies.

• All participants visited the lab once a week for four weeks.

• During each visit, the researchers provided the same foods but increased the portion size of the foods in a randomized order across weeks.

• Each meal consisted of foods with higher calorie density, like garlic bread, and lower calorie density, like salad. Foods were weighed before and after the meal to determine how much was eaten, and calorie intake was determined from these measures.

Conclusions of Study on Weight Loss Programs


The researchers found that when they were given larger portions, participants in all three groups ate more. For example, when the portion size was increased 75 percent, the average amount consumed went up 27 percent.

However, the participants who received training consumed fewer calories overall than those who did not. Even though the participants in all three groups ate similar amounts of food, the participants who received training chose foods lower in calorie density.

Here’s what the Penn State researchers learned from the study:

• All the groups were served the same meals, but their food choices differed.

• The participants who went through the training consumed more of the lower calorie-dense foods and less of the higher calorie-dense foods than the untrained controls.

• The trained participants’ calorie intake was less than that of the control groups, whose intake didn’t differ by weight status.

Barbara Rolls, professor and the Helen A. Guthrie Chair of Nutritional Sciences, Penn State state that “The study supports the idea that eating less of the higher-calorie-dense foods and more of the nutritious, lower-calorie-dense foods can help to manage hunger while consuming fewer calories. You still have a full plate, but you’re changing the proportions of the different types of foods.”

Click here to read the full article about the most effective healthy weight loss programs.