Brown beef and garlic in Dutch oven over medium heat, 4 to 5 minutes breaking up meat into 3/4 inch crumbles.Pour off drippings. Season with salt and pepper.Stir in tomatoes, broth and carrots and bring to a boil. Simmer uncovered 10 minutes.Stir in beans and zucchini and cook 4 to 5 minutes until zucchini is crisp tender. Remove from heat and stir in spinach.