4 keto diet-approved menu items major chains have rolled out across the US

Blaze Pizza became the first national pizza chain to roll out a keto-approved option in the US in July. The fast-casual chain's keto crust has just 6 grams of net carbs, swapping flour for ingredients like flax seeds, eggs, and cheese.

"Pizza crusts are traditionally made mostly of flour, water and yeast," Blaze Pizza's executive chef, Brad Kent, told Business Insider. "Removing the flour brings several challenges since the gluten and starches and sugars (carbohydrates) deliver the desirable light, crispy, and chewy texture in addition to its toasty and yeasty flavor."

The chain's keto pizza features the keto crust, spicy red sauce, mozzarella, ovalini mozzarella, bacon, cherry tomatoes, mushrooms, and spinach.

Read more: Blaze Pizza just launched the first keto-diet-approved pizza crust to be served at a national chain. I tried it and was surprised by how good it was.

In August, Qdoba rolled out its own line of bowls, including the Smoked Brisket Keto Bowl. The bowl features smoked brisket, guacamole, lettuce, pico de gallo, salsa verde, and shredded cheese.

Smoothie King is launching a line of keto diet-approved smoothies on Tuesday, using high-fat, high-protein ingredients like almond butter, cocoa, and almond milk.

The two blends launching this week are Keto Champ Berry, made with blueberries, raspberries, and almond butter, and Keto Champ Coffee, which features almond milk, cold brew, and cocoa. Both smoothies contain Smoothie King's keto protein blend.

"Guests are seeking smoothie options to meet a variety of dietary needs – particularly, we're seeing an increase in lifestyles that limit carbohydrate intake," Smoothie King chief marketing officer Rebecca Miller said in a statement.