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Blockheads has changed with the times. Filled with rice, beans, sour cream, cheese, beef, and guacamole, lettuce and tomato, the chain's original burritos gave a considerable caloric bang for the buck. They were loaded with fat, carbs, protein, and the four basic food groups. Then, a fear of fat and sensitivity to dairy brought about healthy alternatives: soy cheese and tofu sour cream. The latest concession to the Age of Atkins can be found at Blockheads in the form of the low-carb burrito platter, which comes in a special whole-wheat tortilla with grilled chicken, guacamole and cheese. They've even added baked fish fajita burrito to the menu. Luckily, the attempt to lure healthy eaters hasn't affected Blockhead's decided emphasis on having a good time. Low-cost Margaritas and Mojitos are still poured in a variety of sweet fruity flavors, and good music plays to an easy-going vibe inside. During lunch you'll find a mixed clientele: men discussing business, hospital workers, moms with toddlers. It's clear that the fare, filtered through health-conscious sensibilities, is not authentic—but that's okay. This full-service burrito joint is simply out to provide a faux-Mexican food fix in casual digs. — Nancy Davidson

Chicken fajita burrito, $12.95; lo-carb burrito platter, $11.25