This type of exercise suppresses hunger in women more than men, study proves
Find yourself with a bigger appetite on rest days than after logging your hardest workout of the week? Same. It usually takes me an hour or two to feel hunger after an intense session, and while there are plenty of existing studies that have attributed this to a decrease in the hunger hormone grehlin and an increase in the hormone peptide YY, which helps you feel fuller for longer, new research suggests women are more susceptible to this response than men.
Granted, the study was conducted on only a small sample of participants (eight males and six females), but this is the first review to have included women at all, and the findings were notable.
The method was pretty straightforward: participants were asked to fast overnight, before completing bouts of cycling at varying levels of intensity the next morning. These were then followed up with blood tests (to measure amounts of lactate) and self-reports to analyse appetite levels.
Results showed that the females had higher levels of total ghrelin (the hormone that makes you feel hunger) at baseline compared to the males, while they also had ‘significantly reduced levels’ of acylated (AG) ghrelin after intense exercise compared to males. Ghrelin levels were, in fact, much lower in both males and females after intense exercise compared to moderate exercise, meaning that all participants felt ‘less hungry’ after high-intensity exercise compared to after moderate exercise, but this was even more significant for women.
‘We found that moderate intensity exercise either did not change ghrelin levels or led to a net increase,’ the study noted. The authors added that exercise above your lactate threshold may be necessary to elicit a suppression in grehlin. Lactate threshold is the point at which lactate builds up in your bloodstream faster than your body can remove it – it occurs during high-intensity exercise.
Why is this useful to know? The author of the study, Kara Anderson, PhD, says: ‘Our research suggests that high-intensity exercise may be important for appetite suppression, which can be particularly useful as part of a weight loss programme. Exercise should be thought of as a “drug”, where the “dose” should be customised based on an individual’s personal goals.’
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