Complex carbs

What are carbs?
​What foods are complex carbs?
Are lower carb diets beneficial?

Research Notes:
​https://www.nutritionfitnesscentral.com/list-healthy-complex-carbohydrates/

https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/carbohydrates/art-20045705

https://www.eatingwell.com/article/290631/what-is-a-complex-carbohydrate/