When you are stressed, you are in overdrive. When you toss back a triple-shot espresso, you're in overdrive. When you exercise beyond our body capabilities, you're in overdrive. This confuses a lot of people because if they are struggling with excess weight, they assume that they want to speed up their metabolism.
Overdrive can also result from eating a lot of sugar, HFCS, and refined foods. In this case, blood sugar rises and falls, and so does insulin. To compensate for the volatility of rapid rises and falls in sugar and hormones, the metabolism runs fast. In fact, many of my patients who have hypoglycemia (low blood sugar) are fairly slender. It's not until they progress to the "metabolic resistance stage" that they start to gain weight.
As overdrive progresses, the problem magnifies. When insulin levels remain high too long and too often, your brain and muscle cells eventually stop responding. Rather than soaking up blood sugar, muscle cells ignore rises in insulin. Your body starts conserving calories, and you see the results in your gut.
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