Brenda Khan
There are conflicting opinions on whether calories matter when you are on a low-carb diet. Some experts say that calories are all that matter when it comes to weight loss, and that all you need to do is reduce your calorie intake. However, others argue that it is more complicated than that, and that there is more to weight regulation than just monitoring calories in vs. out. Some sources suggest that if you are on a low-carb diet and are not losing weight, you may need to track your calories to ensure you are getting enough, as too few calories can cause your metabolism to slow down.
| Characteristics | Values |
|---|---|
| Calories | They do matter, but they are not the whole story. |
| Weight Loss | A low-calorie, low-carb diet can lead to weight loss. |
| Energy Expenditure | A ketogenic diet can increase energy expenditure by 100-150 calories/day, leading to fat loss. |
| Resting Energy Expenditure | A very low-carb, high-protein diet had the least effect on reducing resting energy expenditure following weight loss. |
| Blood Sugar and Insulin | A low-carb diet focuses on managing blood sugar and insulin levels. |
| Appetite | Low-carb diets that include whole foods can help satiate your appetite and signal fullness to your brain. |
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What You'll Learn
Calories do matter, but they're not the whole story
If you're on a low-carb diet, you may not need to count calories. However, if you're not losing weight, it may be worth tracking your calories to see how much food you're actually consuming. While it's true that reducing calories can lead to weight loss, it's not as simple as just monitoring calories in versus calories out. The energy balance equation, or the idea that weight loss is simply a matter of consuming fewer calories than you expend, doesn't take into account individual differences in metabolism. For example, the type of calorie matters; different types of calories are handled differently by the body, depending on an individual's metabolism. Additionally, weight loss programs can change metabolic rates, which is another factor to consider.
Ultimately, while calories do play a role in weight loss, they are not the only factor. A low-carb diet, for example, follows the rules of science and energy balance, but it's not as simple as just counting calories.
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Counting calories
Calories do matter when you are on a low-carb diet, but they are not the only factor. The original advice about not counting calories on a low-carb diet was because this approach focuses on managing blood sugar and insulin. You are encouraged to eat whole foods that naturally satiate your appetite and send hormonal signals to your brain that you are full. This makes it easier to stay on a low-carb diet than a high-carb diet, which can stimulate hunger and cravings.
However, if you are not losing weight on a low-carb diet, it may be worth looking at how much food you are consuming. Generally speaking, if you take in more calories than your body needs, the extra calories will be stored as fat. Similarly, if you take in fewer calories than needed, your body will release its fat stores, and you will lose weight.
Some studies have shown that low-carb diets have a metabolic advantage, with one study showing a significant increase in energy expenditure associated with a ketogenic diet. However, another study showed that a very low-carb and high-protein diet had the least effect on reducing resting energy expenditure following weight loss.
Overall, while calories are not the only factor, they do play a role in weight loss on a low-carb diet. It is important to be mindful of how much food you are consuming and to ensure that you are not taking in more calories than your body needs.
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The metabolic advantage of low-carb diets
Calories do matter when you're on a low-carb diet, but they're not the whole story. If you're not losing weight on a low-carb plan, it may be worth looking at how much food you're consuming.
Low-carb diets have been shown to have a metabolic advantage. A recent pilot study showed a significant increase in energy expenditure associated with a ketogenic diet. This increase in energy expenditure means that the body is burning more calories, which can lead to weight loss.
Additionally, the thermic effect of food, or the loss of energy as heat during digestion, plays a role in energy expenditure. The second law of thermodynamics states that some energy is always lost in any chemical reaction, including the digestion of food. This means that the idea that "a calorie is a calorie" is not entirely accurate, as the body's metabolism of different types of food can vary.
Overall, while calories do matter, the metabolic advantage of low-carb diets can enhance weight loss and improve metabolic health.
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The thermic effect of food
Calories do matter when you are on a low-carb diet, but they are not the only factor. The thermic effect of food is the loss of energy as heat through the process of digestion, absorption and metabolism. This is consistent with the second law of thermodynamics, which states that some energy is always lost in any chemical reaction.
The original advice about not counting calories on a low-carb diet was based on the idea that this type of diet naturally manages blood sugar and insulin levels, reducing hunger and cravings. By eating whole foods that are high in protein and healthy fats, you can stay full and satisfied without counting calories.
However, if you are not losing weight on a low-carb diet, it may be helpful to take a closer look at your calorie intake. Reducing your calorie intake can help you lose weight, regardless of the type of diet you are following.
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Managing blood sugar and insulin
Calories do matter when you're on a low-carb diet, but they are not the only factor to consider. When people lose weight, they are generally consuming fewer calories than before. However, the energy balance equation, or 'calories in, calories out' approach, is an overly simplistic way of looking at weight loss. This is because different types of calories are handled differently by the body, depending on an individual's metabolism.
If you are struggling to lose weight on a low-carb diet, it may be worth tracking your calories to ensure you are not consuming too many. However, it is also important to ensure you are consuming enough calories, as too few can cause your metabolism to slow down.
When following a low-carb diet, it is important to be mindful of your blood sugar levels and insulin response. Carbohydrates are broken down into glucose, which raises blood sugar levels and triggers the release of insulin. Insulin is a hormone that helps the body's cells absorb glucose for energy or storage. On a low-carb diet, the body has to adapt to using fat as its primary fuel source, rather than glucose. This can take some time, and during this adaptation period, it is common to experience side effects such as fatigue, headaches, and irritability. To manage blood sugar and insulin levels, it is recommended to reduce your carbohydrate intake gradually, rather than all at once. This gives your body time to adjust and can help minimise any negative side effects. In addition, ensuring you are consuming enough calories is important, as too few calories can cause your metabolism to slow down, affecting your blood sugar regulation. Finally, it is beneficial to prioritise complex carbohydrates, such as whole grains, legumes, and vegetables, over simple carbohydrates like sugar and refined grains. Complex carbohydrates are broken down more slowly by the body, leading to smaller increases in blood sugar and a more gradual release of insulin.
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Frequently asked questions
Yes, calories do matter if you are on a low-carb diet. However, it is more complicated than simply counting calories.
The energy balance equation (calories in, calories out) is not a good construct to help guide people. Calories are handled differently depending on the metabolism of the individual.
If you are successfully losing weight on a low-carb diet, you probably don't need to count calories. If you are stalled, plateaued, or unable to lose the last few pounds, you may need to track calories to make sure you are getting enough of them. Too few calories can cause your metabolism to slow down.
