You’ll need to make sure you’re eating enough protein (100 to 150 grams per day) in order to build muscle and tone up, says Catudal. And it may feel counterintuitive to snack on tuna or hard boiled eggs in the afternoon if your go-to before was crackers or an apple. That said, if you’re a hybrid ectomorph and carrying excess fat around your waist, a higher-carb diet might not be the right match for you, says Melina Jampolis, MD, an internist and board-certified physician nutrition specialist in Valley Village, California. “Many patients who have been thin their whole lives gain weight in their belly,” she says. In that case, limiting high-starch choices like pasta and bread in favor of sweet potatoes, oats, and beans may be advised, according to the thinking behind the body type diet. “The good news,” she suggests, “is that this body tends to respond very quickly to cutting carbs, and they can lose weight efficiently,” she says. Still, keep in mind that there’s no one perfect diet for everyone. And if weight loss is what you’re after, another diet plan, such as one that limits calories instead of carbs, can help you reach your goal.

The thin filaments look like two strands of pearls twisted around each other. The thick filaments pull the thin filaments past them, making the sarcomere shorter. In a muscle fiber, the signal for contraction is synchronized over the entire fiber so that all of the myofibrils that make up the sarcomere shorten simultaneously. There are two structures in the grooves of each thin filament that enable the thin filaments to slide along the thick ones: a long, rod-like protein called tropomyosin and Prime Boosts Official a shorter, bead-like protein complex called troponin. Troponin and tropomyosin are the molecular switches that control the interaction of actin and myosin during contraction. While the sliding of filaments explains how the muscle shortens, [Prime Boosts](http://www.fukushima.st/mff/bbs/bbs.cgi/artist.html?quot