This is false.Carbs are evil. That simple. Consume only in whole vegetable/fruit variety (and even then be judicious). More quality protein and fat. Yes, fat. We all went awry when carbs (especially processed) were pushed and fats were vilified.
Track your carbs. Cap at 100grams a day max. Yes, you can cheat on special occasions.
And exercise.
You'll be studdly in 6-9 months.
Complex carbohydrates are used as energy in the body, we need them in our diet. It's the simple carbohydrates that we should avoid. Please learn to distinguish between complex and simple carbs.
Fats are the same way. There are healthy fats (polyunsaturated/monounsaturated) and unhealthy fats (saturated). Please learn to distinguish between the two.
The proper ratio for someone who lifts weights and runs is 1 gram protein + 0.5 gram complex carbs per pound of body weight. I'm 52 years old and still run 3 miles each day (roughly the equivalent of a 5K).
I attended medical school during my time in the US Navy. My advice to everyone is to stop following fad diets and study nutrition.