Pennington Biomedical\u00a0researchers recently\u00a0investigated\u00a0the systems of the body that\u00a0regulate\u00a0weight, exploring whether our bodies defend an established\u00a0weight target or if our bodies\u00a0operate\u00a0within a broader range of tolerance before biological mechanisms are activated.\u00a0The paper,\u00a0titled “Body weight regulation models in humans: insights for testing their validity,” which was recently\u00a0published in\u00a0Nature Reviews Endocrinology,\u00a0examined competing body\u00a0weight regulation\u00a0models\u00a0and analyzed how energy intake and expenditure interact to\u00a0maintain\u00a0or disrupt weight stability.\u00a0<\/p>\n
The biological mechanisms of body weight regulation are not completely understood,\u00a0so\u00a0the\u00a0researchers evaluated the theories behind\u00a0the\u00a0interaction of these\u00a0mechanisms within\u00a0the\u00a0environment, as it\u00a0ultimately\u00a0determines\u00a0body weight.\u00a0The standard “set point” theory states that each person has a biologically determined weight\u00a0and that\u00a0the body reacts strongly when weight\u00a0changes\u00a0go\u00a0above or below that point.\u00a0<\/p>\n
The new\u00a0theory \u2013 the “dual-intervention point”\u00a0\u2013\u00a0states that instead of a singular body\u00a0“set point,” each person has a lower and upper limit, and that the body only reacts when body weight drops below the lower limit or increases above the upper limit.\u00a0This model states that between these limits, weight is mostly influenced by lifestyle and environment, rather than\u00a0the body defending against excessive increases\u00a0or decreases in weight.\u00a0<\/p>\n
Human body weight appears to be regulated by biological mechanisms we still do not fully understand. Our analysis highlights the need to rigorously test state-of-the-art technology whether humans defend a single biologically determined set point or whether they operate within upper and lower intervention boundaries. In response to prolonged fasting or overfeeding, these models predict different metabolic and compensatory responses in people with a low body weight compared to those with a higher body weight.”\u00a0<\/p>\n
\u00a0Dr. Eric Ravussin,\u00a0LSU Boyd Professor and Douglas L. Gordon Chair in Diabetes and Metabolism at Pennington Biomedical<\/p>\n
The importance of evaluating these set point and dual-intervention theories may help to explain why losing weight is so difficult for some people and not others, why some people remain underweight even in today’s food-rich environments, and why body weight slowly but steadily increases for adults as they age. The\u00a0underlying purpose\u00a0of the study is to understand how weight is regulated, which will influence strategies for preventing and treating obesity.\u00a0<\/p>\n
In the set point model, a fixed body weight defense point is assumed, with deviations triggering compensatory responses, like changes in appetite or\u00a0energy expenditure. The\u00a0dual-intervention point model\u00a0splits responses into three categories: a strong biological defense against weight loss, a defense against weight gain, and a mid-range response that factors\u00a0in external\u00a0influences like\u00a0behavior or environment. This theory also\u00a0states\u00a0that the upper boundary has drifted upward over human evolution.\u00a0<\/p>\n
The dual-intervention theory\u00a0proposes that the body\u00a0likely has\u00a0biological systems designed to\u00a0maintain\u00a0weight within a certain range. It is still unknown\u00a0what the body\u00a0intends\u00a0to preserve\u00a0by\u00a0maintaining\u00a0weight, such as body fat, muscle mass, stored carbohydrates\u00a0or even the energy status of cells.\u00a0<\/p>\n
“This analysis offers a useful framework for examining how biological and environmental factors interact to influence body weight,” said Dr. Jennifer Rood, Interim\u00a0Senior Vice\u00a0Chancellor\u00a0and\u00a0Executive Director of Pennington Biomedical. “By comparing set point and dual-intervention models, the research contributes to a clearer understanding of weight stability and weight change. The work by Dr. Ravussin and his colleagues reflects Pennington Biomedical’s continued commitment to advancing thoughtful, evidence-based approaches that can inform future clinical research in obesity.”\u00a0<\/p>\n
Source:<\/p>\n
Pennington Biomedical Research Center<\/a><\/p>\n Journal reference:<\/p>\n