4 ms·Nearly all the fat and cholesterol in an egg is in the yolk. Egg white is pretty much just protein.by icegreentea 16y agoNearly all the fat and cholesterol in an egg is in the yolk. Egg white is pretty much just protein.r0s 16y agoAll the B12 is in the yolk.ac2u 16y agoSee richcollins comment above.