The calorie fallacy is one of the most common and detrimental dietary fallacies.
It is the belief that calories are the essential aspect of the diet and that the sources of these calories are unimportant.
“A calorie is a calorie is a calorie,” they say, implying that eating 100 calories of candy or veggies will have the same effect on your weight.
True, all calories contain the same amount of energy. One food calorie has 4,184 Joules of power in it. A calorie is a calorie in that sense.
However, things are not so straightforward when it comes to your body. The human body is a highly complicated biochemical system with many systems that control energy balance.
Different foods employ different metabolic processes, some of which are inefficient and result in energy loss (calories) as heat (1).
Even more important, different diets and macronutrients significantly impact the hormones and brain areas that regulate hunger and eating behavior.
The foods you consume can significantly influence the biological systems that regulate when, what, and how much you eat.
Here are six scientifically established explanations of why a calorie is not a calorie.
1. Fructose vs. Glucose
Glucose and fructose are the two most common simple sugars in your diet.
The two give the same number of calories gram for gram.
However, the manner they are digested in the body is very different (2).
Glucose can be digested by all of your body’s tissues, whereas fructose can only be processed in substantial amounts by the liver (3).
Here are a few instances of how glucose calories differ from fructose calories:
- The hunger hormone is ghrelin. It rises when you are hungry and falls when you have eaten. According to one research, fructose causes greater ghrelin levels — and hence more hunger — than glucose (4).
- Fructose does not excite the satiety regions in your brain like glucose, resulting in a diminished sense of fullness (5).
- Compared to the same number of calories from glucose, consuming a lot of fructose might promote insulin resistance, belly fat accumulation, elevated triglycerides, blood sugar, and small, dense LDL (6).
As can be seen, the same amount of calories has radically diverse impacts on appetite, hormones, and metabolic health.
It is far too basic to judge nutrients only on the number of calories they supply.
Remember that fructose only has adverse effects when consumed in large quantities. Its primary nutritional sources are added sugar and confectionery.
Don’t be disheartened if you consume a lot of fruits. While they contain fructose, they are also high in fiber and water and have a high chewing resistance, which helps offset fructose’s detrimental effects.
2. The Thermic Effect of Food
Different nutrients use various metabolic pathways.
Some of these routes are more effective than others.
The more efficient a metabolic route, the more energy in the meal is utilized for labor, and less is lost as heat.
Protein metabolic pathways are less efficient than carbohydrate and fat metabolic pathways.
Protein contains four calories per gram. However, a significant portion of these calories is wasted as heat when the body metabolizes it.
Thermic impact of food measures how much various foods increase energy expenditure owing to the energy required to digest, absorb, and metabolize nutrients.
Here is the thermic impact of the various macronutrients (7):
- Fat: 2–3%
- Carbs: 6–8%
- Protein: 25–30%
The exact figures differ, but it’s apparent that protein needs far more energy to digest than fat and carbohydrates (8).
If you choose a thermic effect of 25% for protein and 2% for fat, 100 calories of protein will be reduced to 75 calories, while 100 calories of fat will be reduced to 98 calories.
According to research, high-protein diets increase metabolism by 80-100 calories per day compared to low-protein diets (8, 9).
Simply put, high-protein diets provide a metabolic edge.
3. Protein Kills Appetite and Makes You Eat Fewer Calories
The tale of protein does not end with higher metabolism.
It also causes a dramatic decrease in appetite, causing you to eat fewer calories on autopilot.
According to research, protein is the most filling macronutrient (10, 11).
You can lose weight without monitoring calories or regulating your portions if you boost your protein consumption. Protein makes fat loss automatic (12, 13).
In one research, people who upped their protein consumption to 30% of their calorie intake naturally began consuming 441 fewer calories each day and lost 11 pounds (4.9 kg) over 12 weeks (14).
If you don’t want to diet but want to shift the metabolic balances in your favor, adding extra protein to your diet may be the most straightforward and most tasty approach to promote natural weight loss.
A protein calorie is not the same as a carbohydrate or fat calorie in metabolism and hunger management.
4. The Satiety Index
Satiety is affected differently by different foods. This implies that certain foods will make you feel more full.
Some meals are also simpler to overeat than others.
For example, it may be pretty simple to consume 500 calories or more of ice cream, but you would have to force feed yourself 500 calories of eggs or vegetables.
This is a perfect illustration of how your meal selections may have a significant influence on the total number of calories you consume.
Many factors influence the satiety value of various foods, which is assessed on a scale known as the satiety index (15).
The satiety index measures a food’s capacity to reduce hunger, improve feelings of fullness, and minimize calorie consumption for several hours.
Eating items low on the satiety index will make you feel hungry and eat more. You will eat less and lose weight if you pick meals high on the satiety index.
Boiled potatoes, steak, eggs, beans, and fruits are examples of satiety-inducing foods. Donuts and cakes are examples of low-index foods.
Whether or not you pick satisfying foods will significantly influence your energy balance in the long run.
5. Low-Carb Diets Lead to Automatic Calorie Restriction
Over 20 randomized controlled studies have evaluated low-carb and low-fat diets since 2002.
Low-carb diets result in more weight loss than low-fat diets, frequently by 2-3 times as much.
One of the primary reasons for this is that low-carb diets cause a significant decrease in appetite. People begin to eat fewer calories without even trying (16, 17).
Even when calories are similar, the low-carb groups often lose more weight, which does not consistently achieve statistical significance (18, 19, 20).
The main reason is that low carb diets produce considerable water loss. Excess bloating usually subsides after a week or two (21).
Furthermore, low-carb diets include more protein than low-fat diets. Protein requires metabolizing energy, and the body expends energy to convert protein to glucose (22).
6. The Glycemic Index
There are several conflicts on nutrition, and experts disagree on many issues.
However, one of the few topics virtually everyone agrees on is that processed carbohydrates are bad.
This includes refined grain items like white bread and additional sweeteners like sucrose and high-fructose corn syrup.
Refined carbohydrates are poor in fiber and readily digested and absorbed, resulting in blood sugar increases. They have a high glycemic index (GI), which measures how rapidly meals elevate blood sugar levels.
When you eat food that elevates blood sugar quickly, it usually results in a blood sugar drop a few hours later. When this happens, you begin to crave another high-carb food.
This is often referred to as a “blood sugar roller coaster.”
One research gave subjects milkshakes that were similar in every way except that one contained high-GI carbohydrates and the other had low-GI carbs. Compared to the low-GI shake, the high-GI milkshake enhanced appetite and cravings (23).
Another study discovered that teenage males consumed 81% more calories during a high-GI lunch than a low-GI meal (24).
As a result, the rate at which carb calories enter the system can significantly impact their ability to trigger overeating and weight gain.
If you’re following a high-carb diet, selecting whole, unprocessed carb sources high in fiber is critical. Fiber can slow the pace at which glucose enters your system (25, 26).
Obesity and diabetes are more likely among people who consume the highest high-GI foods. This is because not all carb calories are created equal (27, 28).
The Bottom Line
Calorie sources can have a wide range of consequences on hunger, hormones, energy expenditure, and the brain areas that govern food intake.
Although calories are significant, calculating them or even being aware of them is not required to lose weight.
In many circumstances, modest modifications in diet selection can provide the same or more significant benefits than calorie restriction.
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