soobidoobs wrote: What's wrong with eating carbs? Filling, but v. little fat. Obviously moderation is needed, but I thought carbs are an essential and useful part of a healthy diet? I thought this is about the 5:2 diet, not a non carb diet?
Confused of Norfolk:)
Much of the benefit of fasting comes from the fact you are not eating carbs while you fast (or not much). To lose weight you must lower insulin levels. Insulin is released in response to carbs and works to prevent blood sugar rising too high by packing the carbs away as fat, so if insulin is high your body is in fat storage mode but you want it to be in fat burning mode. Combining 5:2 with low carb helps to keep insulin down. When insulin levels are low and you start burning fat you create ketones from fat to use as fuel which are good because they help nerve function and what's more cancer cells cannot use ketones as fuel so fat burning can help protect against cancer. Eating fats while keeping carbs down encourages the body to use fat for fuel rather than glucose and so it's best to concentrate on reducing carbs not on reducing fats.
In fact, while the body cannot function without protein and fat in the diet, it doesn't actually need carbs at all.
It's more complicated than that, of course, but in a nutshell, keeping carb intake down is a good thing.
Lots more info in the 5:2 lab!