The article you shared is promoting a zero-carb diet, also known as a "carnivore diet," which involves only consuming animal products and no plant-based foods. The author claims that this approach is optimal for human health and can even help prevent or manage diabetes.

Here are some points to consider:

1. **Zero dietary sugar is not realistic**: Humans do require some glucose for energy, as the article acknowledges. While it's true that the body can create its own glucose through gluconeogenesis, it's still necessary to consume some carbohydrates to support various bodily functions.
2. **Insulin response and carbohydrate intake**: Consuming high amounts of carbohydrates, even from plant-based sources, can lead to insulin spikes and negatively impact blood sugar control. However, this doesn't necessarily mean that a zero-carb diet is the best approach for everyone.
3. **The quote from Professor Bart Kay**: While the author quotes the professor as saying that the optimal amount of carbohydrates for humans is zero, I couldn't find any information on Professor Kay or his credentials to support this statement.

Some potential concerns with a zero-carb diet:

* **Nutrient deficiencies**: A carnivore diet can be low in certain nutrients like fiber, vitamins C and E, and potassium, which are commonly found in plant-based foods.
* **Increased risk of kidney disease**: Some research suggests that high protein intake, as seen on a zero-carb diet, may put additional strain on the kidneys.
* **Limited scientific evidence**: There is limited research on the effects of a zero-carb diet on human health, and more studies are needed to fully understand its potential benefits and risks.

In conclusion, while the article highlights some valid points about carbohydrate intake and insulin response, it's essential to approach any dietary recommendations with caution and consider the broader scientific evidence. A balanced and varied diet that includes both plant-based and animal-based foods is still generally recommended for optimal human health.