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Yes. It is good for people of any age to get that much exercise in per day.
(I have a fidbit and I usually get in 2000-3000 steps a day.)
When you ingest a huge amount of sugar. is your bodys response an example of positive or negative feedback explain you reasoning.
When you ingest large amounts of sugar, your body produces a large amount of insulin to compensate, this can lead to an overabundance of insulin, and as a result you may feel a further craving for sugar. This could be considered negative feedback.
Exercise helps move blood and nutrients throughout your body so, it is very true.