Ok so here's an article on waxy maize:
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The WMS Study Summaries
The first study compared way maize to dextrose, slow starch, and a placebo (4). In contrast to common claims, following ingestion, both blood glucose and resulting insulin levels were similar between WMS and slow starch, and 3 times lower than plain dextrose. Measured work output during cycling exercise was not different following either dextrose or WMS ingestion, which were similar to slow starch.
1 / Blood Sugar And Insulin Were Similar To Slow Starch, But Much Lower Than Dextrose
The next study examined 24-hour glycogen resynthesis using WMS, maltodextrin, dextrose, or slow starch (6). WMS-induced glycogen storage and subsequent work performance were not different from that of dextrose or maltodextrin consumption. It wasn't all bad news however, as these three carbohydrates yielded improved performance over slow starch.
2 / 24-Hour Glycogen Resynthesis Was Not Different From Dextrose Or Maltodextrin
A more recent study looked at WMS (a.k.a. "amylopectin") compared to maltodextrin, sucrose (a.k.a. table sugar), and slow starch, using a 1-hour glycemic index test (conducted by one of the researchers who invented it back in the 1980's)(1).
Once again, WMS performance contradicted the frequent claims about apparent rapid absorption. This time, blood glucose levels were not only lower than maltodextrin, but lower even than the slower carbohydrate sucrose. In fact, the glycemic response of WMS was low enough for researchers to call it a "low-glycemic-index treatment", like the slow starch.
3 / Blood Glucose Levels Lower Than Maltodextrin And Sucrose
Far from an isolated incident, a brand new study sought to specifically investigate the glycemic response of WMS ingestion compared to both maltodextrin with a small amount of sucrose, and white bread (10).
Interestingly, the resulting blood glucose response of WMS was similar to that of bread! As you'd expect, this was quite a bit lower than the fast carb mix of maltodextrin + sucrose. Additionally, the insulin response was significantly lower for WMS even compared to the bread treatment (and of course much lower than maltodextrin).
4 / Blood Glucose Similar To, And Insulin Lower Than, White Bread
A final study compared the glycemic response of 25g WMS that was cooked with water into a paste, to that of the same amount of glucose (5). This study is different from the previous WMS studies that used uncooked "native" WMS. The blood sugar levels were similar between groups, leading the researchers to give the WMS a glycemic index rating of 90.
5 / Similar Blood Sugar Response As Dextrose
If we're dissecting the information on WMS -as we should be, especially if we're thinking of spending money on it- then we need to evaluate the glycemic index itself.
Although a full discussion is beyond the scope of this article, it's worth noting that simply measuring blood sugar isn't ideal for a complete understanding of this substance. Adding insulin measurements helps a great deal, although this is still not perfect (for a full review, see 14).
At the same time, it's critical to understand that the purpose of this review is to evaluate the claims surrounding WMS, and then determine how they match up with the available information. Clearly they don't.