The body can synthesize glucose from amino acids or fatty acids if dietary intake is zero.

“glucose is the energy Al life so here we're talking carbohydrates I think most of our audience will be familiar with the so-called macronutrients... glucose is the energy of life every cell on the planet Burns glucose for energy glucose is so damn important that if you don't consume it your body makes it so it will take an amino acid and turn it into glucose that's gluconeogenesis glucogenesis that's right it will take a fatty acid and turn it into glucose and specifically the glycerol portion of the uh triglyceride will turn into glucose”