Eating and Obesity

What occurs when we eat?

when we eat glucose increases which means the pancrease needs to secrete insulin in order for it to travel through the blood and complete its role and travel to the liver where its stored as a fat and glycagon used for energy.

What are three stages of eating?

Cephallic stage- prepatory and absorpative stage - nutrients recieved both have high insulin and glucose and low glucagon. there is also a fasting phase which holds the opposite features.

whats a study which can be argued against to show the role of blood glucose levels in starting a meal?

Campfield and smith found bgl 8 percent drop. in contrast le mangen found bgl does not vary even during fasting phase.

what is gherlin?

it is a peptide hormone seen to be the key to initiating meal time a very much potent stimulator produced by an empty stomach.

Study to support ghrelin?

Cummings showed high ghrelin in blood levels shortly before meal time so a short term hunger signal.

external factors of starting a meal.

Learning- weyingarten and pavlov

adverts

smell

place

time

What is leptin?

A satiety hormone which travels to the brain to signal fulnness and enough energy is stored.

Study showing leptin as an adherent to meal time.

Khaler et al, injecting leptin into mice stops hunger.

Campfield te al, obese mice did not produce leptin.

What is cholecystikininin (CCK)

A peptide hormone made in the small intenstine released as food enters to help digest fats and proteins.

Which researcher found men to eat more in groups.

Berry et al.

Explain the role of the hypothalumus in controlling hunger?

the arcuate nucleus is located in the hypothalumus and is an argregation of neurons which reponds to the scereation of ghrelin by releasing neuropeptide y to other parts of the hypothalumus to make us more hungry.tudy s

study to show the role of hypothalumus in controllling hunger?

Anand and berbreck, found that electrical stimulation prompted hunger whilst lesions to area stopped meal times.

what two hormones are produced in the lateral hypothalumus

Melanin conctrating hormone and orexin and are stimulated by the nuropetitde y to stimulate hunger and lower metabolic rate perserving bodys energy.