Weight loss isn’t about calories-in/calories-out; being a healthy weight (and STAYING THERE), is about being Normal. We’re a chemistry set, not a math equation.
Sunlight, and optimal levels of Vitamin D, are a crucial to being Normal. They help make our chemistry what it should be. Being normal doesn’t just allow us a healthy weight, it also means improved immune function, and prevention and reversal of disease.
There’s a lot of science behind those statements, here some of it: