To encourage ketone production, the amount of insulin in your bloodstream must be low. The lower your insulin, the higher your ketone production. And when you have a well-controlled, sufficiently large amount of ketones in your blood, it’s basically proof that your insulin is very low – and therefore, that you’re enjoying the maximum effect of your low-carbohydrate diet. That’s what’s called optimal ketosis.
Dr. Smith applies this same idea to diet. He maintains that if you eat the same foods all the time, your body adjusts to that specific diet. Your metabolism stabilizes and fat accumulates as a result. By varying the types and quantities of food you eat, you’ll prevent your metabolism from slowing down and trick your body into burning more calories. In this way, diet confusion keeps your metabolism off-kilter and fuels your fat-burning engines.
The reason we’re suggesting 45 minutes instead of the typical 30 as one of the easy ways to lose weight is that a Duke University study found that while 30 minutes of daily walking is enough to prevent weight gain in most relatively sedentary people, exercise beyond 30 minutes results in weight and fat loss. Burning an additional 300 calories a day with three miles of brisk walking (45 minutes should do it) could help you lose 30 pounds in a year without even changing how much you’re eating. Here are 20 hidden reasons your diet isn’t working.
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And so my Twitter followers and people on Facebook, they lost so much weight in such a short period of time—they were losing four pounds in five days, five pounds in seven days; the results were outrageous—they kept asking me for more. And so I kept tweeting them more and emailing them. Before I knew it we had 5,000 people across the country, [and] as far away as the UK, who were on Shred. And they were losing weight hand over fist.
You might feel silly, but it works. When Alan R. Hirsch, MD, neurological director of the Smell & Taste Treatment and Research Foundation in Chicago, tried this with 3,000 volunteers, he found that the more frequently people sniffed, the less hungry they were and the more weight they lost—an average of 30 pounds each. One theory is that sniffing the food tricks the brain into thinking you’re actually eating it.
How does it work? The Shred Plan is based on “diet confusion.” This principle is modeled after a similar strategy in exercise called muscle confusion, which is used to help break through plateaus of muscle growth. When you do the same types of exercises at the same times, your muscles acclimate to the stress and your progress stagnates. Muscle confusion dictates that people work their muscles in different ways for varying durations of time. By “confusing” your muscles, you can trigger their sustained growth and continue to move toward your fitness goals.

"It’s easy to become impatient and frustrated when you’re trying to lose weight and haven’t seen the results yet. But be realistic – you won’t see the affect overnight. Your brain’s wiring plays a huge part in resisting changes in lifestyle, and it takes time to establish new habits – up to 12 weeks. Stick with it for at least eight weeks and you should notice a change."
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