A new scientific report out Tuesday concludes that plastics and the chemicals they leave behind in the environment are a major threat to human health. It identifies over 140 chemicals readily found in plastic products that can harm our bodies, particularly through interfering with the endocrine system.
We’re a little obsessed with moving fat around. And no, we’re not talking about stealing bags of liposuction leftovers to make soap.
If cells were personified, each fat cell would be an overbearing grandparent who hoards. They’re constantly trying to make you eat another serving of potatoes, and have cabinets stacked with vitamins they never take.
Men do go through hormonal cycles. That much is established. Their testosterone levels tend to peak first thing in the morning, perhaps in concert with circadian rhythms, and then diminish over the course of the day—though exercise can cause fleeting spikes. What science has yet to show is whether hormones dip and rise over weeks or months, as women’s do.
As far back as the ancient Greeks, people have documented a funny phenomenon among pregnant women: The skin on their faces sometimes changes color. Scientists never quite knew why that happened, though they suspected that it was linked to the spike in the body’s hormones during pregnancy. Now, a new study published this week in eLife found that two sex hormones, estrogen and progesterone, play a key role in regulating the body’s synthesis of melanin, the substance that gives skin pigment.
The need to find fuel to generate energy is a profound drive within the biology of all living organisms: we all need food to survive. So it’s not surprising that our bodies have such a complex system to control food intake, driven by hormones.