Rabbit starvation....you can expend more energy catching rabbits than you gain from eating them....thus you actually starve even though you're eating food.
It's a balance, we need so many (estimates vary, in the Western world it's a high number though) calories in an average day, but we expend energy to acquire those, and if the weather is miserable, the prey isn't easily available, then starvation was surprisingly common among hunting/fishing tribes.
Inuit tales are full of such stories, and they were superb hunters but they lived in an incredibly challenging environment.
In Africa, where humanity originated, there was (still is in some areas,
https://www.theguardian.com/inequal...cial-to-hunter-gatherers-evolutionary-success
a very different take on things, but they don't need the same amount of calories just to stay warm, or the effort necessary to make skin cagoules, fur clothing, etc., just to exist in their homeland.
That's why we think farming really comes to the fore in other regions, and it does so in many different places worldwide. It's such a good idea, grow crops, gather them, store them safely, and you have a backup plan if the hunting fails.
The problem is though, that if you have a reliable food source, more healthy children survive to adulthood, and they themselves farm and breed and populations grown and before long there's not enough land to go around, and then there's strife.
It's one of the reasons behind the Vikings suddenly breenging out of Scandinavia. They'd developed their iron mining, smelting and tool making, and metal shod ploughs allowed them to open up more farmland and breed more children to adulthood. They rapidly simply swamped their farmlands with too many people. So off they went looking for everything from adventure to land, to slaves to gold, but at heart home was just overcrowded.
To Archaeologists there are no primitive people. There are peoples of the past, but they're just us from a different time.