Low Glycemic Diets are dietary regimens that minimize the consumption of sugar and other easily digestible carbohydrates (eg. refined flour, cereals or mashed potatoes). The purpose of the Low Glycemic Diets are to prevent large spikes in blood glucose (sugar) concentrations.
Individuals with Type 2 diabetes have difficulty regulating their blood glucose levels, and Low Glycemic diets are commonly prescribed for this population. Low Glycemic Diets (especially when combined with protein supplementation) are also commonly used to support healthy weight loss.
Reducing consumption of sugars and refined carbohydrates may help improve acne symptoms for some individuals. There is scientific evidence that high-sugar diets suppress immune function and can trigger hormonal changes, both of which can contribute to the development of acne. Many popular diets, such as the Paleo Diet, are versions of a Low Glycemic Diet.
In general, consumption of significant amounts of sugar (particularly sucrose aka cane sugar) is bad for your health. The reason why sugar, and sucrose in particular, is bad for you is because the human body is not metabolically adapted for its consumption. Refined sugar is a very high-energy, rapidly digested substance that is not readily available in nature. The human metabolic system has been slowly evolving for hundreds of thousands of years based on a diet of largely unrefined plant, fungal and animal products. Refined sugar only became widely available to the general population in the last 200 years. It is no coincidence that rates of obesity, dental caries, heart disease and diabetes track very closely with rates of refined sugar consumption. The bottom line is that eating less refined sugar is a good idea for virtually everyone.
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The effect of a low glycemic load diet on acne vulgaris and the fatty acid composition of skin surface triglycerides. Smith, et al. 2008.
A low-glycemic-load diet improves symptoms in acne vulgaris patients: a randomized controlled trial. Smith, et al. 2007.