In the series finale of the Four Pillars, we’re diving into mental and emotional well-being: the glue that holds your health together (or the reason it falls apart when you see an unwashed dish).

From the "overnight therapy" of REM sleep to why your muscles are actually secret mood-boosting organs, we break down how your biology and your brain are in a constant, high-stakes group chat. Plus, we explore the heartbreaking news that ultra-processed snacks might be the reason you’re feeling "meh," even if you hit your step goal.