Dietary fat proportionately enhances oxidative stress and glucose intolerance followed by impaired expression of the genes associated with mitochondrial biogenesis.
Study Goal
The researchers aimed to investigate the effects of varying dietary fat content on oxidative stress-induced glucose intolerance and organ-specific metabolic responses.
Results Summary
A 60% fat diet induced glucose intolerance, elevated ALT, and reduced GSH levels, with tissue-specific oxidative stress modulation. Withdrawal to a standard diet reversed oxidative damage, particularly in the liver, and identified differential gene expression linked to oxidative stress and mitochondrial biogenesis.
Population
Animal model (rats)
Effective Dosage
30%, 45%, and 60% energy from fat
Duration
12 weeks (with a 10-week withdrawal period for one group)
Interactions
None mentioned
| Intervention | Direction | Endpoint | Population | Dosage | Impact | Claim # |
|---|---|---|---|---|---|---|
diet with 60 energy% of fat | increase | glucose intolerance | rats | - | displayed | #1 |
diet with 60 energy% of fat | increase | high ALT | rats | - | displayed | #2 |
diet with 60 energy% of fat | decrease | low GSH levels | rats | - | displayed | #3 |
diet with 60 energy% of fat | neutral | tissue-specific modulation of the prooxidant/antioxidant enzymatic activities | rats | - | displayed | #4 |
prolonged sustenance of the 60 energy% fat containing diet-fed rats on standard diet | neutral | antioxidant activities | rats | - | led to the alteration of antioxidant activities, reversing the oxidative damage | #5 |
dietary modification | increase | recovery of the antioxidant activities | rats | much more pronounced in the liver as compared to the muscle | displayed an organ-specific response | #6 |
differing fat content | neutral | expression of liver/muscle-specific genes associated with oxidative stress and mitochondrial biogenesis | rats | - | identified the differential expression of liver/muscle-specific genes associated with oxidative stress and mitochondrial biogenesis in response to | #7 |
Consumption of food that surpasses the metabolic necessity of the body leads to an epidemic condition termed obesity, which causes several metabolic disorders including oxidative damage. Dietary intervention can enlighten the mechanisms and therapeutics associated with these metabolic disorders. The reported studies related to diet include fat of different kinds and from different sources, however they lack dose response aspects. Our study highlighted the importance of dietary fat modification in modulating oxidative stress-induced glucose intolerance. Animals were maintained on a diet with a varied content of fat (30%/45%/60%) for 12 weeks and the 'withdrawal' group was fed a standard diet for another 10 weeks. The diet containing 60 energy% of fat displayed glucose intolerance, high ALT, low GSH levels and tissue-specific modulation of the prooxidant/antioxidant enzymatic activities in the liver/muscles. Prolonged sustenance of the 60 energy% fat containing diet-fed rats on standard diet led to the alteration of antioxidant activities, reversing the oxidative damage. Notably, the 'withdrawal' group displayed an organ-specific response towards dietary modification where the recovery of the antioxidant activities was observed to be much more pronounced in the liver as compared to the muscle. Further, we identified the differential expression of liver/muscle-specific genes associated with oxidative stress and mitochondrial biogenesis in response to the differing fat content. These genes can serve as markers for HFD-induced metabolic complications involving the liver/muscle. Altogether, our study has highlighted the novel area where obesity-induced oxidative stress linked alterations expressed diet and organ specific responses that are recovered by altering the dietary regimen. Future investigation of dietary modulation will open nascent avenues for developing therapeutic modalities addressing obesity-related metabolic complications.