When you eat carbohydrate, your metabolism switches over to glucose for a lot of your energy needs. Dr Mike says the same is true of protein, he says if you eat more of it than you need, any extra is burned up for energy, and is used for gluconeogenesis only to the extent that it is needed. I'm sure he's talking generally here, and not about people with more specific metabolic disorders.
Adiponectin is important for switching from a fed to a fasted state. I think mostly what causes the "fed" state is the carbohydrate eaten. But that what keeps you in the fed state longer than you should be is the visceral and the liver fat. If your free fatty acid levels in the liver go too high, carbohydrate is needed to produce glycerol to produce triglycerides. So glycogen needs to be released from storage; so gluconeogenesis needs to occur to replenish glycogen.
Choline is needed to transport fat.
A Choline-Deficient Diet Exacerbates Fatty Liver but Attenuates Insulin Resistance and Glucose Intolerance in Mice Fed a High-Fat Diet
The fat in fatty liver and visceral fat has to break down to free fatty acids to be burned. Once the free fatty acids hit the liver, gluconeogenesis is spurred. Choline is needed for this.
Nicotinic acid (the type recommended) worsens blood sugar. It's alternate form, nicotinamide, does the opposite, and is recommended for fighting diabetes sometimes. Not so fast there. Looking to retrieve that first study I came across this;
In choline deficient rats, nicotinamide supplements further increased liver lipid concentration.
Short term, things that loosen up visceral and liver fat, increasing free fatty acids, may worsen blood sugar control, is my guess. Combined with a diet and exercise program that discourages the formation of visceral fat and fatty liver, in the longer term I bet it would improve things, instead.