New study dispels fears over fish oil-atrial fibrillation link; Research highlights cancer, diabetes risks from food preservatives; Do the new dietary guidelines go too far, or are they a cop-out? Can we crack the code on aging, or are humans just “term-limited”? Patients with depression who’ve tried everything obtain surprising relief from vagus nerve stimulation; Blood sugar spikes after meals—even absent diabetes—can drive Alzheimer’s risk; New study pushes back on Tylenol-autism link, but highlights poor diet, chemical exposure, pre-natal anti-depressant use as potential culprits. And more!