form 4 biology chap6 pt7
Post on 05-Dec-2014
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EATING HABITS• Good & healthy habits to
prevent health problem (related to bad eating habits)
• Good eating habits : right frequency, time of eating, type of food consume
EATING HABITS•Examples of good eating habits :–Eating food that is nutritious & constitutes a balances diet
–Chewing the food well easy to digest
–Eating at specific time to avoid stomach ulcers
–Avoiding the habit of eating too much @ not eating at all
–Eating food that has a variety of nutrients with plenty of fibres
HEALTH PROBLEMS
• GASTRITIS• OBESITY
•ANEROXIA NERVOSA•BULIMIA NERVOSA
GASTRITIS• Caused by bad eating habits (eating too late & not at specific time)
• The empty stomach stimulates the stomach to secrete more gastric juice which contain HCl acid
• The gastric juice acts on the walls of the stomach, causing inflammation of the stomach gastritis long period stomach lining may be eroded to form ulcer gastric ulcer
• Symptoms :– Sharp pain in the stomach, Weight loss– Loss of appetite, vomiting
GASTRITIS
OBESITY• Excessive body weight due to the
intake of too much food that rich in carbohydrates & fats.
• Body weight is 20% more than the actual body weight with respect to the height.
• Easily contract other diseases such as high blood pressure (hypertension), heart diseases & diabetes mellitus
OBESITY• BMI = body weight (kg)
height (m) x height (m)
• Can be avoided in the following ways :– Reduce the intake of food which is rich in
carbohydrates & fats– Exercise frequently– Do not tempted to eat between meals
OBESITY
ANEROXIA NERVOSA• A psychological disease which usually occurs among young women who feel they are too fat & not attractive
• An eating disorder refrain from eating & exercise excessively
• Symptoms :– Excessive loss of weight, mental & emotional problems & malnutrition
• Urgent treatment by specialists is required, can cause death if not treated.
ANEROXIA NERVOSA
BULIMIA NERVOSA•A health problem related to bad eating habits
•Eat excessively & then induce vomiting by putting her fingers down her throat
•Weight loss, malnutrition, emotional & mental disturbances.
BULIMIA
NERVOSA
EVALUATING NUTRIENT CONTENTS OF FOOD
• Criteria have to be considered when choosing food :– The nutrient content– The freshness– The presence of chemical substances (artificial flavourings, preservatives & colourings not good for health & can cause cancer
• Food Act (1983) & Food Regulation (1985) : all processed food must have a food label to show the nutrient content of the food, the chemical substances used & the expiry date of the food
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