A UCSF-led study in aged mice identifies ferritin light chain 1 (FTL1) upregulation in hippocampal neurons as the dominant proteomic shift correlating with cognitive decline. Experimental elevation of FTL1 in 3-month-old animals rapidly induced dendritic simplification, synaptic loss, and memory deficits, while CRISPR and shRNA-mediated reduction in 18-24-month-old mice restored synaptic density and behavioral performance. The mechanism centers on FTL1-driven sequestration of iron in the Fe3+ state, impairing mitochondrial iron-sulfur cluster assembly and lowering ATP availability required for synaptic maintenance. This preclinical work (mouse model, n typically 8-12 per group in such designs, no human RCT data) contrasts with observational human studies linking brain iron accumulation to Alzheimer's risk. Related findings in Nature Communications (2022) on ferritin in microglia and a Cell Metabolism paper (2021) on mitochondrial iron in aging neurons were overlooked in initial coverage, which underplayed potential off-target effects of systemic ferritin modulation and lacked discussion of sex-specific responses or long-term safety. Conflicts of interest appear minimal in the core team, though broader neurodegeneration funding often involves biotech ties. Overall evidence grade remains early-stage animal data requiring rigorous human validation.