Your daily caloric intake is highly dependent on individuals, and that is entirely based on their metabolic rate. There is actually a very cute little formula that any nutritionist can work out; how much kilojoules per person should be consuming. That is based on their metabolism and basic energy required to sustain life. Then there is also energy that is expended with physical activity. Right now I am writing and I’m using up energy to do that. Then there is energy that is expended doing actual prescribed exercise, like going for a jog, a 30 minute walk, or doing a weight session. Depending on how intense or how much sedentary activity a person has in their day, whether they are sitting at the computer all day and sitting in front of the TV all night, versus someone who is maybe doing computer work during the day and then a 1½ hour gym session at night versus someone who is very active and on the move all the time, will determine how much kilojoules someone should have in their day. It is a really quick, easy formula.
I cannot say every obese person should have 8,000 kilojoules. It is highly determined on your age, gender, guys and girls are a bit different, height, and then your physical activity levels. As a person decreases in weight that energy requirement also decreases but as their physical activity levels may increase you can actually increase your energy intake as well. There are very different factors that affect it, and if someone really wanted to know how much kilojoules they should be eating, I would highly suggest they see an accredited, practicing dietitian or a registered nutritionist. They can easily work it out. It is tailored to each individual.
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