It will. We had two bodies being dissected when I took my human anatomy class- 1 was a 79 year old guy who was a breeze to dissect, and another was an obese 62 year old man... He was an absolute bitch to dissect due to the layers upon layers of adipose fat throughout his body.  Fun fact: as you work on the body and it warms up to room temperature because of your hands and the ambient environment, the solid fat will melt into a substance that is not unlike fake movie theater popcorn butter in appearance and texture.