They have limited evidence about the long term consequences, health risks and side effects
There is still limited study on the effects of having low carbohydrates diet. Evidence are not enough to guarantee the safety and efficacy of this type of diet specially in losing weight. The effect of having low carbohydrates in the diet can lead to decrease output of the thyroid, increased input on cortisol, impaired mood and cognitive function, muscle catabolism, suppressed immune function.
During exercise there is an increase in physical activity and muscle cells respire more than they do when the body is at rest. The heart rate increases during exercise. The rate and depth of breathing increases - this makes sure that more oxygen is absorbed into the blood, and more carbon dioxide is removed from it.
