When young adults drink sugary drinks with high-fructose corn syrup, their bodies produce more lactate after meals — and this lactate might be a big reason why their cells start ignoring insulin over time.

What we've found so far does not support the idea that post-meal lactate explains how HFCS-sweetened drinks lead to insulin resistance in young adults. In fact, the evidence we've reviewed leans against this explanation. Our analysis of the available research shows that while it is sometimes suggested that lactate produced after meals could play a key role in the development of insulin resistance in young adults who consume high-fructose corn syrup (HFCS)-sweetened drinks, this idea is not backed by the data we examined [1]. We reviewed one specific assertion proposing that increased post-meal lactate from HFCS consumption might be a major reason why cells begin to ignore insulin over time [1]. However, this claim is contradicted by 54.0 studies or data points in our analysis, with zero supporting it [1]. This means that the body of evidence we’ve looked at does not align with the idea that lactate is a primary driver in this process. We want to be clear: our current analysis doesn’t prove lactate has no role, nor does it confirm exactly how HFCS might affect insulin sensitivity. We’re simply reporting what the evidence shows based on what we’ve reviewed so far. There may be other pathways involved, and our understanding could evolve as we analyze more data over time. For now, if you're trying to manage your metabolic health, it may be more useful to focus on overall dietary patterns rather than zeroing in on lactate as a culprit. The link between sugary drinks and insulin resistance is still worth taking seriously — we just don’t see strong evidence that post-meal lactate is the reason why.