Is it true, consuming carbs only after exercising (not before) provide a better insulin sensitivity and glycogen synthesis than if consumed before?

Pre and post: Post-workout meal is indeed the most important meal of the day. Your muscular supply of glycogen is drained, making your muscles hungry for nutrients. "This is the time you want to decrease protein breakdown and increase protein synthesis, so it's vital to get enough protein and carbohydrates after you finish each workout. Pre-work carbs are needed though for fuel and energy.