I'm sorry to hear about your mother. The increase in sugar intake is an attempt for the brain to get fuel.

This broken pathway is what ketones bypass. But to get them a good diet is essential. By the time people refuse to eat hearty meals I don't know what can be done.

What a GLP-1 medication is doing is not specific to Alzheimer's. The threat is more than glycation, because the physical crushing of organs, nerves, and pathways cause damage, too.