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Biological ageing refers to the decline in tissue/organismal function, whereas chronological ageing simply indicates the time passed since birth. In normally ageing individuals, chronological age equates to biological age.
The observation that individuals do not age at the same pace led to the concept of biological ageing, also called functional or physiological ageing. Whereas chronological ageing refers only to the passage of time, biological ageing relates to decline in function.
Source: Journal of the American College of Cardiology
Volume 75, Issue 8, 3 March 2020, Pages 919-930
core body temperature
- Core body temperature refers to the temperature of the internal environment of the body. This includes organs such as the heart and liver, and the blood.Source: https://study.com/academy/lesson/core-body-temperature-definition-measurement.html
- Core temperature the temperature of structures deep within the body, as opposed to peripheral temperature such as that of the skin. Source: https://medical-dictionary.thefreedictionary.com/core+temperature
high metabolismIf your metabolism is "high" (or fast), you will burn more calories at rest and during activity. A high metabolism means you'll need to take in more calories to maintain your weight. That's one reason why some people can eat more than others without gaining weight.Source:https://www.health.harvard.edu/diet-and-weight-loss/does-metabolism-matter-in-weight-loss#
A person with a "low" (or slow) metabolism will burn fewer calories at rest and during activity and therefore has to eat less to avoid becoming overweight. Source:https://www.health.harvard.edu/diet-and-weight-loss/does-metabolism-matter-in-weight-loss#
up-sell or upsell
To try to persuade a customer who is already buying something to buy more, or to buy something more expensive. Source: https://dictionary.cambridge.org/dictionary/english/upsell
- A sales technique used to get a customer to spend more by buying an upgraded or premium version of what's being purchased.Source: https://www.shopify.com/encyclopedia/upselling
- A practice of encouraging customers to purchase a comparable higher-end product than the one in question, while cross-selling invites customers to buy related or complementary items. Though often used interchangeably, both offer distinct benefits and can be effective in tandem. Source:https://www.bigcommerce.com/ecommerce-answers/what-difference-between-upselling-and-cross-selling/