Joe Rogan and other fans of the carnivore diet are quick to praise the perks of eating only meat, and there's no denying that this way of eating delivers plenty of protein. For example, just six ounces of cooked chicken breast packs over 54 grams of protein, which is more than most people need in a day. Along with all that protein, you're also getting B vitamins, potassium, zinc, and about 54 milligrams of magnesium.

But hardcore carnivore dieters often go beyond muscle meat and recommend eating organ meats, which are typically even richer in nutrients. If you ever spot "sweetbreads" on an appetizer menu, don't be fooled. They're not sugary or bread-like at all. Sweetbreads are actually organ meats that come from the thymus gland of young lamb, beef, or veal.

Nutritionally, sweetbreads

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