Would a fat person last longer in a famine?

Can omnivores switch their diets to survive on whatever is available? Would a fat person last longer in a famine than a more svelte subject? How does serology help in the management of Covid-19? Could we use GM technology to develop a healthy form of tobacco? How and why do chameleons change colour? Why does ice stick to your skin? Why does a shop-bought chicken have tender meat and softer bones than animals reared at home? Join Dr Chris Smith and Talk Radio 702's Azania Mossaka for the answers...