In the realms of nutrition and weight management, there is a belief that to keep fit or lose weight; one must expend at least as many calories as one consumes. Many pseudo-dieticians, social media influencers, and celebrities promote this idea. Though the principle of “calories in, calories out” has some relevance, understanding why this concept and calorie restriction fail is critical for long-term weight management.
But, before we debunk the “Calories in, Calories Out” weight-loss myth, we need to look into when and how this method came to be in the first place.
The genesis of the concept of “calories in, calories out.”
The term calorie first appeared in the 1800s to describe how heat engines worked. A calorie was defined as the amount of heat required to raise one gram of water by one degree Celsius. However, by the twentieth century, popular culture in the United States brought this concept into the realm of nutrition.
The issue that should have been raised in this case is whether an engineering design can effectively explain the human body. And, do we operate in the same way as our car does? The answer to this question requires more research into the factors that influence human metabolism.
The "calories in, calories out" technique of weight loss is debunked by the following seven factors.
1. Calories are burned slowly
According to conventional dieticians, if we cut or expend 500 calories per day more than we take, we will lose 0.5 to 1 kilogram of body mass/fat each week. However, contemporary research shows that the actual rate of weight loss is far slower than what traditional dieticians propose.
2. Genetic Influence
The way we cope with calories is also heavily influenced by our genetics. Some people have a stronger ability to metabolize fats, whereas others can metabolize carbohydrates better. Some people exercise and see immediate weight loss, while others can train for a marathon yet not lose weight as predicted.
3. Gender difference and its impact on the outcome
Our capacity to reduce weight is heavily influenced by our fat-to-muscle ratio. Women's fat-to-muscle ratio is often higher than men's. This means that at rest, women burn about 5–10 percent fewer calories than men.
4. Calorie measurement methods that are incorrect
The technique by which we measure calories is also debatable. The reliance on a mobile application, in particular, is dubious, given there is now proof of calorie distortion in many food products, such as almonds.
5. Micronutrient’s Influence
The calorie is also influenced by the micronutrient ratios we ingest. Protein, for example, burns at a higher temperature than carbs. As a result, those who eat a high-protein diet expend more energy digesting and assimilate the protein.
6. Hormones and calorie intake
Insulin and glucagon are key hormones for blood sugar control and, as a result, fat storage. Other hormones that affect appetite, desires, and fullness include leptin and ghrelin. Changes in one hormone can cause changes in others, all of which will affect calories and, as a result, your weight loss or gain.
7. Stress and its consequences
Stress has a significant impact on hormones. Hence it plays an important role in weight management. Stress might be useful in the short term because it helps you get through difficult life situations, but long-term chronic stress can be harmful to your weight because it affects your cortisol levels.
The main stress hormone in the body is cortisol. It regulates how carbs, lipids, and proteins are used by the body. Studies suggest that chronic long-term stress can raise cortisol levels and disturb the natural cortisol rhythm, which can lead to weight gain.
Conclusion
Even while calories are important, the number of factors we covered above suggests that counting calories or even being aware of them is not essential for weight loss. People have recently begun to emphasize the quality of their nutrition rather than the quantity. And rather than counting calories, they are now focusing on foods that aid in weight loss and help them maintain good health. Because, in many cases, simple dietary changes offer better benefits than calorie restriction.
To summarise, the "calories in, calories out" weight-loss measurement approach is a farce that should be abandoned.
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