I think it's only really relevant if you have diabetes or other disorders that affect blood glucose (e.g. reactive hypoglycemia), as long as people know that in general sugars (and potatoes!) will cause spikes in blood sugar, and so should be consumed in moderation.
Although, even if you do have diabetes or the like, IMO just using the number of grams of carbohydrate and sugar in something is usually enough information, as you know that, in general, carbohydrates will cause your blood sugar to rise, and sugars will cause it to rise rapidly.
I have reactive hypoglycemia, and knowing the GI of a few foods is useful, only because you wouldn't think they were that bad (potatoes!) - but after learning it, just the macros are enough make a decision.
Although, even if you do have diabetes or the like, IMO just using the number of grams of carbohydrate and sugar in something is usually enough information, as you know that, in general, carbohydrates will cause your blood sugar to rise, and sugars will cause it to rise rapidly.
I have reactive hypoglycemia, and knowing the GI of a few foods is useful, only because you wouldn't think they were that bad (potatoes!) - but after learning it, just the macros are enough make a decision.