People who lost their sensitivity to sweetness tend to put more sugar in their foods to satisfy themselves. But adding more sugar leads to overweight and obesity.

‘An overweight or obese individual who lost sensitivity to sweetness may seek out for more amounts of sugar in their foods to satisfy themselves.’

Nutritionists, researchers and doctors have long suspected a connection between diminished taste sensitivity and obesity, but no one had tested if losing taste altered intake. In his research, Dando temporarily dulled the taste buds of study participants and had them sample foods of varying sugar concentrations.




For the blind tests, the researchers provided participants with an herbal tea with low, medium or high concentrations of a naturally occurring herb, Gymnema Sylvestre, which is known to temporarily block sweet receptors. During the testing, participants added their favored levels of sweetness to bland concoctions.
Without realizing it, they gravitated to 8 to 12 percent sucrose. Soft drinks are generally around 10 percent sugar. "That's not a coincidence," said Dando. But those participants with their taste receptors blocked began to prefer higher concentrations of sugar.
"Others have suggested that the overweight may have a reduction in their perceived intensity of taste. So, if an overweight or obese person has a diminished sense of taste, our research shows that they may begin to seek out more intense stimuli to attain a satisfactory level of reward," explained Dando. This can influence their eating habits to compensate for a lower taste response, he said.
The study showed that for a regular, sugary 16-ounce soft drink, a person with a 20 percent reduction in the ability to taste sweet would crave an extra teaspoon of sugar to reach an optimal level of sweetness, as compared to someone with unaltered taste response.
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