Junk Food Is Ruining Your Brain’s Fat Calendar
Your body keeps track of time in ways you never really notice. Beyond sleep and wake cycles, it responds to seasonal cues. New research suggests dietary fat plays a role in that timing, acting as a biological signal that helps the brain interpret the season. Certain processed fats appear to interfere with that process. The study, led by researchers at the University of California, San Francisco, and published in Science , examined how mice adjust to seasonal changes in light. When lighting shifted to mimic winter, some mice adapted quickly. Others adjusted more slowly, maintaining higher body temperatures and delayed daily rhythms , patterns associated with summer physiology. The difference wasn’t calorie intake. It was fat composition. In natural environments, food sources change with the seasons. During colder months, plants and animals contain higher levels of polyunsaturated fats. Those fats help tissues function at lower temperatures and also serve as a signal. Higher levels co...