Upper limit of what is considered healthy gluconeogenesis is slightly short of what can be provided. Brain needs ~120g of glucose, you're about 30-40g short of that.

30-40g is almost nothing, could be, say, a cup of frozen berry mix, mixed right into 3/4th a cup of plain real greek yogurt, with some turmeric, ginger, and cinnamon mixed in.

It can also subsist on top of ketone bodies - if fat breakdown is high enough due to a lack of glucose due to fasting or lack of other storage such as glycogen.

Also, it's possible to subsists and survive without food for quite a while.