Eating enough fiber — not protein — should be your focus, a top nutrition scientist said. He shared 3 easy ways to hit your goals for both macronutrients.

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• Top nutrition scientist Tim Spector said that most people get enough protein, but not fiber.
• He recommended people focus on increasing the amount of fiber they eat each day.
• His tips include switching meat for beans and eating different types of plant-based protein.

High-protein foods from cereal bars to pasta have taken over grocery...