@92d47f9f: Dr. Jack Kruse's ideas are considered controversial by some in the medical and scientific communities because they are not always supported by peer-reviewed research. While some of his recommendations, such as spending more time outdoors and avoiding exposure to artificial light, are generally accepted as beneficial for health, other claims, such as the idea that modern technology is causing widespread health problems, are not widely supported by scientific evidence.
Additionally, some experts have criticized Kruse for promoting a ketogenic diet as a one-size-fits-all solution for health problems, despite the fact that this type of diet may not be appropriate or effective for everyone. As with any health advice, it's important to consider the evidence and consult with a qualified healthcare professional before making any major changes to your lifestyle or diet.