Myth one: ‘Negative calorie foods’ such as celery burn up more energy than you consume
If only it was as simple as eating your way to thinness, but there is no such thing as a negative calorie food. Even the humble stick of celery, while being about 95% water, still contains a small amount of kilojoules from carbohydrate (65 kJ to be exact). There certainly is an energy cost to your body in digesting food, but that equates to about 10% of the energy in the food. So even celery adds some kilojoules to your diet, and while it’s a small number, it’s definitely not a negative number.
Myth two: A slow metabolism is to blame for most people’s weight gain
This is a common myth among people trying to manage their weight. Research studies have shown that resting metabolism, which is the number of kilojoules used by the body at rest, increases rather than decreases as people gain more weight. As someone gains more weight from storing fat, the body needs to support that extra weight so more muscle is added. The more muscle you have, the higher your metabolic rate tends to be even at rest. Only in rare situations where a person may have an underlying medical condition such as an under-active thyroid gland could weight gain be explained by a ‘slow metabolism’.