From Glucose to Vitamin C: A Lost Metabolic Ability and Thoughts on the Future

One of the most interesting features of human metabolism is that we lack a fundamental biochemical ability possessed by most mammal species: the capacity to convert glucose into vitamin C. The L-gulonolactone oxidase (GULO) enzyme, which performs this conversion, has lost its function in humans and a few other primate species during the evolutionary process.

Today, we know that dogs, cats, cattle, and many other mammals can convert glucose into vitamin C in their bodies. This ability was lost in the evolutionary lineage of primates approximately 61 million years ago. Interestingly, the incidence of diabetes in these animals is quite low compared to humans. This situation may be related to the ability of glucose to be used in alternative metabolic pathways.

The complex nature of metabolic processes leads us to consider new therapeutic approaches. For example, it could theoretically be possible to convert a portion of the glucose in the blood into vitamin C by immobilizing the L-gulonolactone oxidase enzyme on a specially designed semi-permeable membrane system that could be placed in a central vein. This approach could offer a new treatment strategy for different types of diabetes.

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From an evolutionary perspective, the loss of this enzyme appears more complex than a simple story of "use it or lose it." Precise control of blood pH balance is one of the organism's fundamental priorities. Constant production of vitamin C (ascorbic acid) could increase blood acidity and affect lactic acid metabolism. This could restrict behaviors requiring high physical activity, such as hunting.

Modern medical technologies offer the possibility of precisely controlling blood pH. In light of these developments, restoring the pathway for the conversion of glucose to vitamin C could be considered a treatment strategy that requires careful evaluation. 

A particularly noteworthy point is that the excretion of vitamin C from the kidneys is easier compared to glucose. This feature could be one of the metabolic advantages of a potential treatment approach. Furthermore, reducing the formation of advanced glycation end-products (AGEs) also appears theoretically possible.

Advances in modern biotechnology and genetic engineering point to promising developments regarding the restoration of lost metabolic abilities. However, the safety and long-term effects of such an intervention require comprehensive research.

Evolutionary biology can guide us not only in understanding the past but also in developing future treatment strategies. In the treatment of metabolic diseases, restoring lost abilities through modern technology emerges as one of the new horizons of medicine.

As research in this field continues, it is important to consider the complexity of metabolic processes and the organism's priority of maintaining homeostasis. Future treatment approaches may be shaped as a synthesis of an evolutionary perspective and modern medical technologies.