Posted 4/30/12 on The Doctor Weighs In
Last Sunday on his show on CNN, Dr. Sanjay Gupta interviewed pediatrician, Dr. Robert Lustig, who made the assertion that sugar is toxic, and probably carcinogenic. This attention-grabbing statement had earned him a wide following on UTube. But is it true? Let’s examine the evidence.
How is sugar used in the cell?
Every cell in our body needs energy in order to survive and perform its functions. Our biochemistry has evolved over billions of years to extract energy from simple sugars, like glucose and fructose. I mentioned the evolutionary ancient-ness (is this a word?) for a reason. In the beginning (relax, I am not getting into the creation debate) the atmosphere was poor in oxygen. Yet cells had to extract energy from their nutrients. The solution? Extract energy from glucose without the participation of oxygen. This process is called anaerobic glycolysis, and even today, there are anaerobic bacteria that survive solely through glycolysis. This process nets a measly 2 ATP molecules (these are the molecules that store the energy necessary to drive chemical reactions in the cell), and two 3-carbon molecules of pyruvic acid.