I grew them on my plot many years ago but they spread like wildfire and it took ten years to get rid of them.
They taste OK but beware the gas! They have high levels of inulin which is a polysaccharide called a fructan that isn't absorbed from the gut and gets fermented by gut bacteria. Certainly not recommended if you have irritable bowel syndrome or diverticular disease!
All this is true; but inulin is often called "soluble fibre" and is one of the current top "super foods" because it can
prevent many bowel problems by encouraging 'friendly bacteria'.
However everyone on this forum is probably already getting more than enough from other root vegetables - it's only the fast food addicts that would really benefit - I have a very low opinion of their average 'nous' - if they actually give a fig about their health they are probably dim enough to pay up to £100 a kilo for it online.
J. Arts contain 10-15% inulin and they are the only food I know that is regarded as both gourmet food and pig food - and pretty much nothing in between. We all know how easy they are to grow - I suspect the wholesale price is 10% or less of the £3.50 a kilo "gourmet price" you would pay in the shops
Apart from starting your own religion I can't think of many things more lucrative than growing inulin!
Cheers.