Bring a large pot of salted water to a boil and cook the whole wheat spaghetti according to package directions until al dente.
While the pasta cooks, place the diced pancetta in a large cold skillet and turn the heat to medium, cooking until the fat renders and the pancetta is golden and crispy.
Add the minced garlic to the skillet with the pancetta and sauté for 1 minute until fragrant, then turn the heat to the lowest setting.
In a medium bowl, whisk together the whole egg, liquid egg whites, grated parmesan, and black pepper until smooth and well combined.
Reserve 0.25 cup of the starchy pasta water, then drain the pasta and immediately add it to the skillet with the pancetta.
Add the spiraled zucchini to the skillet and toss with the hot pasta for 30 seconds to slightly soften the ribbons.
Remove the skillet from the heat entirely; this is crucial to prevent the eggs from scrambling.
Pour the egg mixture over the pasta and zucchini, tossing constantly and adding a splash of the reserved pasta water as needed until a creamy, glossy sauce forms.
Season with sea salt if needed and serve immediately in a warm bowl.