So anyone can tell you that if you want to lose weight you need to eat less food and do more exercise. This advice is quite right, based on the principle that the body responds to its energy balance.
But, if the principle of energy balance is so simple, then why is it so hard for people to lose weight?
Our genetic inheritance as well as our environment also influences this balance.
All people are different. The genes that we inherit from our parents can affect how easily we gain or lose weight. Some people will move around more than others and use up more energy. Some people absorb their food a little more efficiently than others. Some people have a stronger craving for fatty, sweet foods than others. So even in places where conditions make it hard for someone to gain weight, you will see people of different size and shape due to these inherited differences.
When we talk about our societies, food is now plentiful, affordable, and always all around us. Have a look at your local supermarket - a lot of the foods that are strongly advertised are energy-dense foods or drink with high sugar, salt, or saturated fat. Not only that but many packaged items are advertised as healthy choices when really they are high in calories and low in nutrition.
Over the decades, the portion size of many ready-to-eat foods has increased considerably which encourages over-eating as many of us have grown up being told not to waste food. Very often you will find that the main foods for sale are not salads, fruit, and whole-grain bread and cereal products but energy-dense chips and fried foods, refined pasta covered in cheese, rice dishes heavy with oil, sugary cakes, and biscuits.
Keeping a balance of energy in and out is just not the right answer when it comes to weight loss. A food supply that does not emphasize healthy choices is one which makes it much harder for people to lose weight.
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