Make the Pasta: If using traditional pasta, bring water to a boil in a saucepan over high heat. Cook the fettuccine noodles according to package directions until al dente.
Make the Alfredo Sauce: In a saucepan, heat butter on low until melted, add garlic, and cook for 2 minutes so garlic flavors the butter.
Add the flour to the pan and whisk into the garlic and oil to form a paste. Gradually add in the milk over low heat; keep stirring until the sauce starts to thicken.
Add in lemon juice, lemon zest, cream cheese, parmesan cheese, red pepper flakes, parsley, salt, pepper, and whisk until everything the cheese is melted.
Make the Shrimp: Spray a medium sized pan with cooking spray and add the shrimp, cook for 2 minutes. Add in zucchini noodles, and cook 3-5 more minutes until the zucchini is hot and shrimp are cooked.
Combine: Add low-fat alfredo sauce to zucchini noodles and shrimp and let cook together for 2 minutes. Plate evenly into 4 servings and garnish with additional parmesan cheese and parsley!