Spaghetti Squash with Veggie Tomato Sauce

Article written and reviewed by Robby Barbaro, MPH
Published March 6, 2026

A Comforting Pasta Alternative That Supports Steady Energy

This Spaghetti Squash with Veggie Tomato Sauce delivers everything you love about a classic pasta dish—savory tomato sauce, satisfying texture, and a warm, comforting feel—while using whole, plant-based ingredients that support metabolic health.

Tender strands of roasted spaghetti squash replace traditional pasta, while a hearty tomato and lentil sauce provides richness, flavor, and lasting fullness. It’s a perfect meal when you want something cozy and satisfying without feeling heavy afterward.

Spaghetti Squash for a Light, Fiber-Rich Pasta Alternative

Spaghetti squash transforms into tender, noodle-like strands when roasted, making it an excellent whole-food substitute for refined pasta. It provides fiber, hydration, and volume while keeping calorie density low.

Because it’s primarily made up of water and fiber, spaghetti squash helps you feel full while supporting digestion and steady blood sugar.

Lentils for Plant Protein and Blood Sugar Stability

Green lentils add substance and staying power to the sauce. They’re rich in soluble fiber and resistant starch, which slow digestion and help regulate how quickly glucose enters your bloodstream.

Lentils also provide plant-based protein, helping this dish function as a complete, satisfying meal without needing additional protein sources.

Tomatoes, Garlic, and Basil for Flavor and Antioxidant Support

Crushed tomatoes create the foundation of the sauce, bringing natural sweetness, acidity, and rich flavor. Tomatoes are also a concentrated source of antioxidants like lycopene, which support cellular and cardiovascular health.

Garlic and dried basil deepen the flavor naturally, allowing the sauce to taste rich and satisfying without added oils or processed ingredients.

Spinach for Added Nutrients and Freshness

Fresh baby spinach adds color, texture, and micronutrients while blending seamlessly into the warm sauce. Leafy greens increase the nutrient density of the meal while keeping it light and easy to digest.

Adding spinach at the end preserves its freshness and texture.

Bring It All Together

This Spaghetti Squash with Veggie Tomato Sauce is a simple, satisfying way to enjoy a pasta-style meal while supporting steady energy and metabolic health.

With fiber-rich lentils, antioxidant-packed tomatoes, and tender squash noodles, it delivers comfort and nourishment in every bite—without relying on refined grains or heavy ingredients.

Spaghetti Squash with Veggie Tomato Sauce

Cook Time 2 hours
Servings 2 Serving
Calories 447 kcal

Ingredients
 

  • 6 cups (930g) Spaghetti Squash - About 1 medium-sized squash
  • 1 tsp (2g) Black Pepper (to taste) - Available in spice jars
  • 2 cups (484g) Crushed Tomatoes (canned) - Available in 15-ounce cans
  • 2 cups (396g) Green Lentils (canned, drained and rinsed) - Available in 15-ounce cans
  • 4 (12g) Garlic Cloves - About 1 medium-sized bulb
  • ½ tsp (1g) Dried Basil - Available in spice jars
  • 1 cup (30g) Baby Spinach (chopped) - Available in 16-ounce containers

Instructions
 

  • Preheat the oven to 400°F and line a baking sheet with parchment paper.
  • Carefully slice the spaghetti squash in half lengthwise and discard the seeds. Place the halves on the baking sheet and season with black pepper to taste. Turn the squash flesh-side down and bake for 40 minutes.
  • Meanwhile, combine the crushed tomatoes, lentils, garlic, additional black pepper, and dried basil in a pot over medium heat. Bring to a simmer. Once simmering, add the spinach and stir just until wilted. Turn off the heat.
  • Remove the spaghetti squash from the oven and let cool slightly. Using a fork, scrape the flesh into noodle-like strands. Transfer to a strainer to allow excess liquid to drain.
  • Divide the spaghetti squash between plates or containers and spoon the vegetable tomato sauce over the top. Serve immediately, or let cool completely before covering and storing in the refrigerator.

Notes

  • No Spaghetti Squash: Use zucchini noodles or sweet potato noodles instead.

Nutrition

Calories: 447kcalCarbohydrates: 90gProtein: 26gFat: 2.8gFiber: 24g

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About the author 

Robby Barbaro, MPH

Robby Barbaro, MPH is a New York Times bestselling co-author of Mastering Diabetes: The Revolutionary Method to Reverse Insulin Resistance Permanently in Type 1, Type 1.5, Type 2, Prediabetes, and Gestational Diabetes.

Robby was diagnosed with type 1 diabetes at the age of 12 and has been living this lifestyle since 2006. In that time, while eating pounds of fruit every day, his HbA1c has been stable with a current A1c of 5.3%, TIR of 92%, and average total daily insulin use of 30 units.

Robby graduated from the University of Florida and is the cofounder of Mastering Diabetes and Amla Green. He worked at Forks Over Knives for six years before turning his attention in 2016 to coaching people with diabetes full time.

He is the co-host of the annual Mastering Diabetes Online Summit, a featured speaker at VegFest LA, and has been featured on The Doctors, Forks Over Knives, Vice, Thrive Magazine, Diet Fiction, and the wildly popular podcasts the Rich Roll Podcast, Plant Proof, MindBodyGreen, and Nutrition Rounds.

Robby enjoys exercising every day, spending time with friends, and sharing his lifestyle on Facebook, Twitter and Instagram.