Why do so many of us overeat – even when we know it’s bad for us?
Like many questions in biology, much of the answer to this question lies in evolution. We know that animals have generally evolved to seek and consume convenient, energy-dense foods. All living things require energy to survive and reproduce, and it makes intuitive sense that genes associated with finding and eating lots of easy calories might be favored by natural selection. This instinct is also evident in humans in natural environments. Hunter-gatherers, who live in conditions similar to that of our evolutionary ancestors, gravitate to delicious high-calorie fare, although they don’t find a great deal of it. When they do get something extra tasty and high in energy – like ripe fruit, fresh meat, and honey – they will gorge on it.
Not unlike us. Modern humans are subject to these impulses as well. So what’s different? Our environment has dramatically changed. Rather than getting rare seasonal opportunities to gorge on rich foods, we are now constantly surrounded by such delicacies. We did not evolve with any need to resist these kinds of tasty treats – so perhaps it is unsurprising that we so often fail despite our best intentions.
In this episode of humanOS Radio, I talk once again with Dr. Stephan Guyenet, this time about his new book, The Hungry Brain, which was just released this week.
In his book, Stephan addresses the fundamental question of why we overeat. It’s not necessarily for a lack of education on nutrition. Rather, it is due to evolutionarily-conserved circuitry in the brain, which drives us to overeat for short-term pleasure – even when we know it’s at the expense of our health and well-being. In the show, he explains how these circuits work to regulate energy intake and body fatness.
Much of this is based on physiology and genetic predispositions – but that doesn’t mean you can’t do anything about it. We also discuss things you can do to manage these primal impulses in a fattening world, and make sure that your daily behaviors are in alignment with your health and weight goals.