High-Fat Diet & Weight Gain: Metabolic Dysfunction Explained
- Consuming a high-fat diet triggers significant changes at the cellular level, increasing the risk of weight gain, diabetes, and other chronic diseases.
- The study, conducted on mice, revealed that a high-fat diet affects hundreds of enzymes involved in sugar, lipid, and protein metabolism.
- Interestingly, the researchers found that administering an antioxidant alongside the high-fat diet largely reversed the observed damage.
High-fat diets can trigger notable cellular changes leading to weight gain and metabolic disorders: Discover how in this groundbreaking study. MIT researchers pinpointed the specific metabolic enzyme dysregulation—the primary_keyword—causing these harmful effects. The research, conducted on mice, found that a high-fat diet impacts various enzymes involved in sugar, lipid, and protein metabolism, with male mice showing more pronounced effects. The study also highlights the role of antioxidant treatment to reverse manny negative side effects. This research, published in Molecular Cell, provides vital insights, and the team is now investigating how antioxidants could treat obesity-associated metabolic dysfunction, a key secondary_keyword. Stay informed with News Directory 3 for the latest findings. Discover what’s next in this essential research.
High-Fat Diet Alters Enzymes, Fuels Weight gain
Updated May 29, 2025
Consuming a high-fat diet triggers significant changes at the cellular level, increasing the risk of weight gain, diabetes, and other chronic diseases. MIT researchers have identified specific metabolic enzyme dysregulation associated with this weight gain, offering new insights into how diet impacts metabolic health.
The study, conducted on mice, revealed that a high-fat diet affects hundreds of enzymes involved in sugar, lipid, and protein metabolism. Thes disruptions lead to increased insulin resistance and an accumulation of damaging reactive oxygen species. the effects were notably more pronounced in male mice compared to females.
Interestingly, the researchers found that administering an antioxidant alongside the high-fat diet largely reversed the observed damage.
“Under metabolic stress conditions, enzymes can be affected to produce a more harmful state than what was initially there,” said Tigist Tamir, formerly of MIT and now at the University of North Carolina at Chapel hill School of Medicine. “Then what we’ve shown with the antioxidant study is that you can bring them to a different state that is less dysfunctional.”
The research,published in Molecular Cell,builds on previous work from Forest White’s lab at MIT,which linked high-fat diets to chronic stress signaling pathways within cells. The new study focused on the role of enzyme phosphorylation in these responses.
Phosphorylation, the addition of a phosphate group, can activate or deactivate enzymes, allowing cells to quickly adapt to environmental changes. Many metabolic enzymes, responsible for converting food into essential molecules, undergo phosphorylation.
researchers analyzed databases of human enzymes, focusing on those involved in metabolism.They found that many metabolic enzymes that undergo phosphorylation belong to the oxidoreductase class, crucial for reactions like glycolysis. Enzymes such as IDH1 and AKR1C1, vital for sugar and fatty acid metabolism respectively, were identified, along with those managing reactive oxygen species.
The study showed that phosphorylation of these enzymes can either increase or decrease their activity as they respond to food intake. Most of the metabolic enzymes identified are phosphorylated in regions crucial for binding to molecules or forming functional enzyme pairs.
“Tigist’s work has really shown categorically the importance of phosphorylation in controlling the flux through metabolic networks,” White said.”It’s basic knowledge that emerges from this systemic study that she’s done, and it’s something that is not classically captured in the biochemistry textbooks.”
Comparing mice on high-fat and normal diets, the researchers found that phosphorylation of metabolic enzymes led to a dysfunctional state with redox imbalance, resulting in more reactive oxygen species than the cells could neutralize. These mice became overweight and insulin resistant.
“In the context of continued high fat diet, what we see is a gradual drift away from redox homeostasis towards a more disease-like setting,” White said.
Female mice, however, showed a greater ability to compensate for the high-fat diet by activating pathways involved in fat processing and metabolism.
“One of the things we learned is that the overall systemic effect of these phosphorylation events led to, especially in males, an increased imbalance in redox homeostasis,” Tamir said. ”They were expressing a lot more stress and a lot more of the metabolic dysfunction phenotype compared to females.”
When mice on a high-fat diet received the antioxidant BHA, many of these effects reversed. These mice experienced less weight gain and avoided prediabetes.
“They’re experiencing a lot of metabolic dysfunction, but if you co-administer something that counters that, then they have enough reserve to maintain some sort of normalcy,” Tamir said.
The antioxidant treatment appeared to restore a more balanced state within the cells,reducing reactive oxygen species and systemically rewiring metabolic enzymes.
“The study suggests that there is something biochemically happening in cells to bring them to a different state – not a normal state, just a different state in which now, at the tissue and organism levels, the mice are healthier,” Tamir concluded.
What’s next
Tamir plans to investigate whether antioxidant treatment can effectively prevent or treat obesity-associated metabolic dysfunction, and to determine the optimal timing for such interventions.