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Calories in vs calories out is a concept that seems simple enough — but is actually much more nuanced.
If we inherently know that the shorthand “calories in, calories out (CICO)” indicates how energy balance influences the gain or loss of body mass, then the solution should be pretty straightforward: “eat at a caloric deficit and you’ll lose weight.”
While this is technically true, one particular problem with that statement alone is that it gives nothing in the way of actionable advice.
CICO is a concept that seems simple enough — but is, in fact, much more nuanced. Unfortunately, that nuance is often overlooked leaving many feeling frustrated and defeated when they are unable to consistently maintain their diet adherence.
Complications start to arise when, even if one is meeting their macronutrient goals each day, they find themselves feeling drained, undernourished, and ultimately, extremely hungry. The likelihood that their diet will be mentally sustainable in the long run in order to achieve results is low and/or requires an incredible amount of discipline and stress.
A major factor in this is that the phrase “calories in vs calories out,” on its own does not elaborate on the caloric density of foods, and especially, satiety or satiation.
So, let’s take a step back.
The energy density (or caloric density) of a food is based on its macronutrient content and balance. Proteins are broken down into amino acids, complex carbohydrates are broken down into simple sugars (eventually converted to glucose), and fats are broken down into free fatty acids.
Different macronutrients provide different amounts of calories per gram:
Protein: 4 calories per gram
Carbohydrates: 4 calories per gram
Fat: 9 calories per gram
Satiety is your body’s response to the availability of nutrients from the food that you have already digested and processed.
Satiation is your immediate reaction to the food ingested. That initial cue you get to stop eating.
Think of satiation as a best guess of your future satiety by your body. It makes this estimate based on different sensory inputs like smell, taste, texture, and stomach distension (i.e. how much it expands/stretches).
So what exactly can we take from all this and put into practical applications in order to maximize diet adherence and sustainability?
What is Volume Eating
Volume eating is a concept, strategy, or diet method of prioritizing high-volume foods to help induce satiety and satiation with the resulting intention of reducing overall caloric intake. It ultimately takes into consideration that a food’s physical weight and caloric content are not directly correlated.
Typically, foods that are richer in fat content are considered “low-volume foods,” given that fat contains more than double the calories per gram compared to protein and carbohydrates.
While lean protein, low sugar carbohydrates, and options high in fiber and/or water content are considered “high-volume foods.”
Focusing on nutrient-dense high-volume whole foods helps to keep you satisfied for longer since most (such as vegetables) are lower in calories per serving, have rich sources of fiber and water, and, quite literally, help to keep your stomach feeling fuller. (4)
When study subjects eat foods low in caloric density (i.e. vegetables) are compared with those consuming foods denser in calories – studies found that those eating higher caloric concentrations consumed twice as many calories per day in order to satisfy their hunger. (2)
Examples of High-Volume Low-Calorie Foods
Lean protein (Turkey, Chicken Breast, etc).
Leafy green vegetables (Cabbage, Lettuce, Spinach, Kale, etc.)
Cruciferous vegetables (Broccoli, Cauliflower, Brussels sprouts, etc.)
Stem and other vegetables (Peppers, Asparagus, Zucchini, Celery, Cucumbers, etc.)
Some Fruit (Blueberries, Raspberries, Watermelon, etc.)
Examples of Moderate-Volume Moderate-Calorie Foods
These options are still high in water and fiber content but moderate in sugar content. Making them slightly higher in calories per serving.
Fruit (Bananas, Mangoes, Cherries)
Root vegetables (Beets, Carrots, Potatoes, etc.)
Oatmeal (pro-tip: check out Steel Cut Oats).
Another benefit to Volume Eating is that it allows for larger quantities of food consumption. For those who prefer filling meals and the feeling of going to bed on a full stomach, this can be a game-changer psychologically while maintaining a caloric deficit. (1) Not only does it allow for larger portions (bigger, fuller plates of food), but it also helps to increase your intake of fiber, vitamins, and minerals at the same time without much effort. (8)
A 12-week study of 96 women with excess weight and obesity found that meals with a lower calorie density led to decreased cravings, increased feelings of fullness, and reduced hunger (4).
The Bottom Line
Higher volume does not always mean higher calories — it all depends on what you are creating that volume with.
Volume eating is an effective dieting tool that focuses on increasing the consumption level of lower-calorie foods. If you consider yourself a “volume eater” it is important to be mindful of portion sizes of low-volume foods, while still allowing yourself the flexibility to enjoy high-volume foods without as much concern. If you are using a food diary, indulging in ice cream or Oreos once in a while shouldn’t be difficult to add in. The end goal is to put emphasis on staying sane, consistent, reducing hunger pangs, and getting adequate nutrition while in a deficit.
Volume Eating also helps to make you more aware of your eating habits and food choices, so that you can make healthier dietary decisions.
That said, Volume Eating can lead to unintentional limits on healthy fat intake (such as nuts, seeds, avocados, whole eggs, and oils). Not only are healthy fats essential for hormone production, but monounsaturated and polyunsaturated fats may reduce inflammation and protect against chronic conditions such as heart disease.
Fill up on foods with high fiber and/or water content so that you can eat a larger volume of food while staying within your caloric deficit.
Steer towards foods with a high satiety index. This is where a high-protein diet consisting of lean options can be key.
Don’t sacrifice your nutritional needs. Eggs, avocados, steak, etc. are all still amazing sources of nutrients AND variety. Caloric density isn’t the only consideration.