Is yo-yo dieting, repeatedly gaining and losing weight, bad for me?
Yo-yo dieting carries real risks, particularly for cardiovascular health and psychological wellbeing, although some widely feared effects (such as a permanently slower metabolism) have not been proven. Aiming for a stable, sustainable weight is healthier than repeatedly following strict diets and then relapsing.
At least a third of people who diet end up gaining more weight than they originally lost. Prospective studies show that repeated dieting, especially at a young age, can predict future weight gain and obesity. For many people, yo-yo dieting therefore defeats its own purpose.
Large epidemiological studies find an association between large fluctuations in body weight and higher mortality, particularly from cardiovascular disease. It should be noted that these are associations found in population studies, not proof that yo-yo dieting itself is the cause. Other factors, such as pre-existing illnesses or eating problems, may distort the picture.
People of normal weight appear to face greater risk than overweight people who do the same thing. With each relapse, blood pressure and blood sugar can temporarily rise above normal levels, placing additional strain on the cardiovascular system. One biological explanation is that fatty tissue temporarily becomes oxygen-deprived during rapid weight gain, causing inflammatory substances to be released. However, this mechanism has not yet been definitively confirmed in human research.
Two popular myths are not supported by the research. Yo-yo dieting most likely does not permanently slow resting metabolism, and subsequent weight-loss attempts do not necessarily proceed more slowly either. Nor does muscle mass structurally give way to fat as a result of repeated weight fluctuations. Both in human and animal research, body composition remained largely the same over the longer term.
What does appear to be a real risk is psychological distress. Multiple studies link yo-yo dieting to binge eating, a more negative self-image and greater dissatisfaction with life. For people with severe obesity, experts are clear: the benefits of weight loss still outweigh the risks of yo-yo dieting, but the goal should be a lasting change in eating and exercise behaviour, not a short period of dieting.
Based on reviews, a meta-analysis and epidemiological studies. No large randomised trials are available; some of the associations with mortality and disease were found in population studies in which causality is difficult to establish.
I am overweight -- what will losing weight do for me?
Losing weight delivers measurable health gains from as little as 5% weight loss: better blood sugar, lower blood pressure and less pressure on your knees. Combine diet with strength training to preserve muscle mass and reduce the risk of weight regain.
Why is it harder for me to lose weight than it used to be?
Ageing lowers your energy expenditure through muscle loss and a slower metabolism, making weight loss objectively harder. Strength training two to three times per week is the best-supported way to slow that process and support weight loss, ideally with professional guidance.
Does the timing of meals throughout the day affect your weight?
When you eat matters: meals earlier in the day appear more favourable for your metabolism than eating late, although the effect varies from person to person and the strongest evidence is still based on short-term studies.
How bad is sitting for too long for your blood sugar and metabolism?
Sitting for long uninterrupted periods noticeably impairs your blood sugar and metabolism, but short breaks of 2-3 minutes of movement every 20-30 minutes already undo a large part of that damage.
What does chronic stress do to your weight in the long run?
Chronic stress contributes to long-term weight gain and abdominal fat through elevated cortisol, inflammation, and less healthy behavior. Stress-management programs or lifestyle support that address cortisol and eating behavior are therefore not a luxury but a logical component of weight management.
Does it matter what time of day I eat?
Eating earlier in the day is more beneficial for your weight, blood sugar and hormonal balance than eating late or at night. The effects have been demonstrated in randomised studies, but the average weight loss is small: around 1 to 2 kg.