Want to boost your memory and mental focus — starting at breakfast? According to neuroscience professor Claire Williams at the University of Reading, there’s one simple ingredient that can make a big difference: walnuts. Yogurt mixed with muesli (a blend of oat and bran flakes) — with one version including a handful of walnuts. The results were clear:Those who had the walnut breakfast performed significantly better on cognitive tests throughout the day. So whether it’s walnuts or flaxseeds, adding a brain-boosting ingredient to breakfast can sharpen your thinking all day long.