Energy is needed by the body to stay alive, grow, keep warm and move around.
Energy is provided by food and drink. It comes from the fat, carbohydrate, protein and alcohol the diet contains.
Energy requirements vary from one individual to the next, depending on factors such as age, sex, body composition and physical activity level.
Energy expenditure is the sum of the basal metabolic rate (the amount of energy expended while at complete rest), the thermic effect of food (TEF, the energy required to digest and absorb food) and the energy expended in physical activity.
To maintain body weight, it is necessary to balance the energy derived from food with that expended in physical activity. To lose weight, energy expenditure must exceed intake, and to gain weight, energy intake must exceed expenditure.
For most adults, an ideal BMI is in the 18.5 to 24.9 range.
•For children and young people aged 2 to 18, the BMI calculation takes into account age and gender as well as height and weight.
•If your BMI is: •below 18.5 – you’re in the underweight range
•between 18.5 and 24.9 – you’re in the healthy weight range
•between 25 and 29.9 – you’re in the overweight range
•between 30 and 39.9 – you’re in the obese range
•One of the reasons why it’s so hard to lose weight is because changes in your appetite hormone levels make it difficult to lose weight and keep it off. When you lose weight, your body’s natural response includes an increase in a key hunger hormone and a decrease in fullness hormones, undermining your ability to lose weight and keep it off.
Appetite hormones after weight loss
•Your body works against you as you lose weight—making you feel hungrier and less full.
Saxenda is an FDA-approved prescription injectable medicine that may help some adults with excess weight (body mass index [BMI] ≥27) who also have weight-related medical problems or obesity (BMI ≥30), lose weight and keep it off. Saxenda® should be used with a reduced-calorie meal plan and increased physical activity.
•is 97% similar to a hormone released after eating that makes you feel full and satisfied •Saxenda triggers areas of the brain that controls appetite and makes you feel more satisfied and less hungry, meaning you eat less, which can result in long-term weight loss.
People who cannot have this treatment:
•low blood sugar •dehydration •suicidal thoughts •gallstones •inflammation of the gallbladder •decreased kidney function •Pregnancy or breastfeeding •pancreatitis •medullary thyroid cancer •multiple endocrine neoplasia type 2 •family history of medullary thyroid carcinoma •kidney disease with likely reduction in kidney function •an abnormally fast heartbeat •History of eating disorders – anorexia/bulimia