The most important aspect of food is to learn how to avoid glucose spikes. This is covered in the 3rd part, while the first one defines glucose and glucose spike and the second part talks about why these spikes are harmful to us.

I've learnt that the order of eating completely matters. The author also explains why it is so. There is explanation given for many other recommendations as well.

"If you want to snack, go savory instead of sweets" - totally taking this into practice. ( )