Alice discusses the global issue of Vitamin D deficiency and her research into what she calls the "Vitamin D3 myth". She explains that Vitamin D is essential for the body, likening it to electricity that powers a home. She mentions that every cell in our body has a Vitamin D receptor, particularly concentrated in the brain, bones, and gut. She also discusses the correlation between Vitamin D deficiency and various health issues, including cancer, arthritis, fibromyalgia, and cardiac problems.