Exercise and Appetite: Why the Scale Can Lag Behind the Effort

Have you ever finished a hard workout, felt hungrier than usual, and then found that the scale barely moved? You are not imagining it, and you are definitely not doing anything wrong. Something real is going on, and it depends on how much exercise you do. This is general education, not medical advice.

A trial with three doses of exercise

In 2009, Church and colleagues reported a secondary analysis of the DREW trial in PLoS ONE. It followed 411 sedentary, overweight or obese postmenopausal women (average age about 57, average BMI about 32) for six months. They were assigned to a no-exercise group or to supervised exercise at one of three doses, at a moderate intensity:

• Low dose: about 72 minutes a week.
• Middle dose: about 136 minutes a week.
• High dose: about 194 minutes a week.

Attendance was excellent, above 99 percent in every exercise group. The researchers compared actual weight change with the loss predicted from the energy the exercise used.

What happened to the scale

• Low and middle doses: people lost about 1.4 kg and 2.1 kg, in line with predictions of about 1.0 kg and 2.0 kg. There was no significant shortfall.
• High dose: people lost about 1.5 kg, against a predicted loss of about 2.7 kg. That gap of about 1.2 kg is what the authors called compensation, meaning the body, or behavior, made up part of the difference.
• Waist size: every exercise group shrank their waists compared with the control group, and this did not depend on how much the scale moved. That is a lovely win.

Why the scale can lag

The study measured weight, not hunger, so it cannot say why. Possible reasons include eating a little more, moving a little less for the rest of the day, or changes in body composition such as gaining some muscle while losing fat. Self-reported food intake in the trial did not show a clear difference between people who compensated and those who did not, but the authors noted that the questionnaire was not sensitive enough to rule out eating more. In a separate controlled study of lean adults, as summarized in a review, people made up about 30 percent of the exercise energy deficit on average, with large differences from person to person.

What this means for you

• Moderate amounts worked as predicted. In this group, about 70 to 140 minutes a week of moderate exercise tracked the math.
• More is not always more on the scale. Very large doses may bring smaller returns than expected, though the other benefits for fitness and health are real.
• Look beyond the scale. Waist size, strength, energy and stamina often improve even when weight changes little.
• Take tracker burn numbers lightly. Watches and machines can be far off, as we explain in our guide to calories-burned estimates, so eating back whatever a device says can erase the effort.
• Keep the rest of the day active. Everyday movement, covered in our NEAT article, can drop after a hard workout without you noticing.

Handling hunger after exercise

• Plan a satisfying meal. Protein and fiber help; see why some foods fill you up more than others.
• Drink water and give it a few minutes. Thirst and hunger can feel alike.
• Check in on hunger. Noticing whether you are truly hungry, rather than rewarding yourself automatically, makes choices easier. Weight Wire’s free journal has hunger and fullness check-ins and an activity log that tracks minutes and steps rather than calories burned.

Where this fits in the bigger picture

Exercise is a strong tool for health and for keeping weight off, as we describe in how much exercise helps with weight loss and maintenance. Weight loss from exercise alone tends to be modest, and the simple “calories in, calories out” arithmetic has limits, as explained in the 3,500-calorie rule. Appetite is regulated by many hormones, which we cover in our guide to leptin, ghrelin and GLP-1.

Sources

• Church TS, Martin CK, Thompson AM, Earnest CP, Mikus CR, Blair SN. Changes in weight, waist circumference and compensatory responses with different doses of exercise among sedentary, overweight postmenopausal women. PLoS ONE, 2009;4(2):e4515 (design, group sizes, weight and compensation figures read from the open-access paper).
• Whybrow S, Hughes DA, Ritz P, et al. The effect of an incremental increase in exercise on appetite, eating behaviour and energy balance in lean men and women feeding ad libitum. British Journal of Nutrition, 2008 (the roughly 30 percent compensation figure comes from a summary, not the full paper).
• U.S. Department of Health and Human Services. Physical Activity Guidelines for Americans, 2nd edition.