Paleo Diet Despite its good word of mouth, the paleo diet scores poorly when it comes to weight loss, convenience factor, and long-term sustainability. The fad diet's popularity may come from the simplicity: The idea is to simply cut out any foods that wouldn't be available in the Paleolithic era. That leaves no room for processed foods, refined sugar, dairy, legumes, or grains. You're left with meats, fish, poultry and fruits and veggies. Critics claim that wiping out entire food groups is unsustainable in the long term, making the diet a difficult lifestyle choice. That's not to say it's impossible to lose weight. If you calculate calories to burn more than you eat, like with any other meal plan, you'll drop weight. But study results are slim. One "underpowered" study found that 14 participants lost an average of five pounds after three weeks. If you're a carnivore, however, there are plenty of recipes to choose from.
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