Starch IS a carbohydrate. It doesn't matter what the source.
Where did you read this?about its being good for insulin sensitivity? I've never seen anything like that and I'd doubt it anyway.. It would take some very good science to make me believe that; it doesn't make sense. Starches are digestible carbs and I'd have to do a LOT of searching to find which types of starch molecule are present in potatoes andd in what way potato starch differs from wheat starch, maize starch, rice starch etc.
I looked at the article and it talks about starch which is modified to make it less digestible. By that time it isn't potato starch any more.
Hana
Here is one of the quotes from the second article (
http://caloriesproper.com/?p=4153)
"A lot of people have expressed concern over the net carbs in raw potato starch. Cummings and Raben estimated the indigestible fraction to be 40 and 54% (w/w), respectively. I get it. For what it’s worth, I’m convinced that said net carbs won’t impact your blood glucose levels…"
I have my own doubts because, like GI/GL, a lot will depend on the individual response - testing for effects of resistant starch on healthy individuals will doubtless be have different results than tests on Type 2's for example. There's also the highly variable nature of the number of amylase genes among individuals/populations due to adaptation to eating starches (see Chris Masterjohn on Carbohydrate Intolerance:
http://blog.cholesterol-and-health.com/2012/11/my-ahs-2012-talk-is-now-up-oxidative.html)
Nobody is going to force anyone to try the stuff - if people like experimenting, it's a fairly simple thing to try out for themselves. If you're not interested, that's fine, but making blanket statements like "starch is a carbohydrate. It doesn't matter the source" is unnecessarily reactionary, IMO.
Some other research that might be of interest: A study on the use of slow release starch to treat hypoglycaemia in Type 1's:
http://strathprints.strath.ac.uk/26053/
More info on Super Starch which is becoming increasingly popular with endurance/keto athletes like Peter Attia:
http://generationucan.com/super.html
It's a huge rabbit hole of research if you want to follow it. I find the whole area of the human microbiome absolutely fascinating.