When kids with obesity and metabolic syndrome cut back on fructose without changing their calorie intake, increases in a gut-related chemical (d-lactate) go hand-in-hand with increases in fat-making activity and blood fat levels — suggesting these processes are connected in the body.

What we've found so far is that changes in d-lactate appear to be linked to fat production and blood triglyceride levels when children with obesity and metabolic syndrome reduce their fructose intake. Our analysis of the available research shows this connection, but we are still building our understanding. We reviewed evidence from 53.0 assertions that support a link between d-lactate and fat-related processes in children with obesity and metabolic syndrome who cut back on fructose without changing their total calorie intake [1]. These findings suggest that when fructose is reduced, increases in d-lactate—a compound related to gut activity—are seen alongside increases in the body’s fat-making activity and levels of triglycerides in the blood [1]. This pattern indicates these biological processes may be connected, though we cannot say from this evidence alone how or why. No studies or assertions in our analysis refuted this link. However, we only have one distinct assertion to draw from, even though it is supported by 53.0 data points or analyses. This means the evidence we’ve reviewed leans toward a connection, but we don’t yet have a full picture. We cannot determine from this data whether d-lactate is directly involved in fat production or if it’s simply a marker that appears at the same time. Our current analysis does not confirm cause and effect, nor does it explain the mechanism. There may be other factors at play that we haven’t accounted for. As we gather more evidence, our understanding of this relationship could change. Practical takeaway: In children with obesity and metabolic syndrome, cutting back on fructose might influence both gut-related chemicals and fat metabolism. While the numbers suggest a link, it’s too early to say exactly what it means for long-term health.