Why do I Have Food Cravings & 10 Honest (and Totally Doable) Science Backed Strategies to Finally Outsmart Your Food Cravings – Part 1
We’ve all been there. Standing in front of the fridge, shoving the carefully prepared veggie snacks aside, and reaching for the cheesecake you hid way in the back hoping you’d forget about it instead. You’ve heard if you’re really hungry you’ll eat those carrots—or an apple—but the pull that cheesecake has on you . . .? It’s hard to resist that craving. So hard. If food cravings are affecting your life, you’re not alone.
Before we dive into everything you need to know about food cravings, the big questions are: Why do we get food cravings? Can we overcome them? And if so, how?
When we know more about where food cravings come from, we can answer these questions, stop feeling guilty and be more compassionate with ourselves.
Let’s dive into how we can manage our irresistible food cravings and also stay on track to reaching our health and fitness goals.
Food cravings vs. hunger
When we really (really!) want to eat one specific food, that’s a craving. Food cravings are “frequent, intense, and irresistible desires to consume a particular type of food.”[1] Cravings start as soon as we think about that food. Sometimes we can’t stop thinking about it. The longing for that food can consume our thoughts and compel us to find and eat it, even if that means stopping what we’re doing and heading straight to the fridge, cupboard, or store right now.
Hunger is different from cravings. With hunger, we want food, but it’s often a less intense feeling and just about any food will do. Hunger satisfies our basic need for sustenance. When we’re truly hungry, just about any food will satisfy us . . . at least temporarily (until the next hunger pang comes along). You feel hunger as a physical response. Your stomach may feel “empty”, or “hollow” or you may just have a sensation that you need to eat soon.
Cravings, on the other hand, are when you could really go for that cheesecake/biscuit/chocolate (you get my drift) and nothing else will do.[1,2]
What food cravings can do to us
It’s no surprise that food cravings can significantly impact us on physical, emotional, psychological and neurocognitive (brain) levels. For example, our cravings can hijack our brain’s reward systems, giving us so much pleasure when we act on them. This feeling can lead to overeating and, over time, this may contribute to weight gain (see my blog about energy balance).
Food cravings are powerful. Research suggests that some people experience them more strongly than others. For example, people who naturally tend to have a stronger cravings also tend to:
- Overeat
- Have a higher body-mass index
- Try to lose weight unsuccessfully
- Be more prone to eating disorders.[3]
Those who experience excess weight or obesity are often at an even bigger disadvantage when it comes to food cravings. Studies show that people with a higher body-mass index tend to experience stronger cravings for foods that are more energy dense (food that are high in calories and low in nutrients).[1] You may have heard that the more you give in to your cravings the stronger they become.
What triggers our food cravings in the first place is our natural physiology.
The physiology of a food craving (it all starts with a cue)
According to one commonly used research tool, the Food Craving Inventory (FCI), there are five types of foods that we typically crave:
- Sweet
- High-fat
- Starchy
- Fast food
- Fruits and vegetables.[2]
Cravings for these foods can feel intense and powerful. Have you ever noticed that seeing a food advertisement or smelling something cooking can make you want that particular food right then and there even if you’ve just eaten? These sights and smells are called “food cues” and they are what kickstarts cravings.
Being exposed to food cues ramps up our cravings and desire to eat on different levels: On a physical level, food cues increase our production of saliva and insulin. Our bodies are literally preparing to digest the food it expects us to be eating soon. On an emotional level, certain sights and smells can remind us of times when we felt comfort and joy while enjoying those foods. On a neurocognitive level, food cravings also activate certain “reward areas” of our brains.[5]
Food cues turn into cravings like this:
- Step 1: You see or smell or think about a food and want to eat it even if you’re not hungry (remember, cravings are different from hunger). This is when the brain has a high desire for and preoccupation with a specific food or type of food. You think about the food and it’s so hard to stop thinking about it.
- Step 2: Your craving leads you to get up and start seeking out that food.[6]
What does this mean? That our brains can be triggered and they play a big role in our food cravings.
Food cues are everywhere and they kickstart your cravings
Food cues are everywhere!
Whether we’re looking at a screen, listening to a show, reading a magazine or newspaper, passing a billboard, or even getting some fresh air and exercise around our neighbourhoods, we are surrounded by food cues. We’re inundated with ads, logos, banners, and other sights, smells, and memories. Convenience store windows have posters of craveable snacks. As we go by restaurants, bakeries, and cafes, they let off aromas of their mouth-watering freshly baked and cooked goods.
You can be out to pick up a head of broccoli, a new pack of pens, or an herbal tea and what’s there waiting for you at the counter? Chocolate, gummies, potato chips, and craveable snacks of all kinds
FUN FACT: Research shows that people who live in environments with an abundance of food make about 200 food-related decisions every day! That’s a lot of thinking about food and deciding what, where, when, and how to eat.[7]
As you can see, our food environment gives us a never-ending supply of food cues that trigger our natural cravings.
Seeking and finding those craveable foods
Once you’ve registered a food cue that has kickstarted a craving, why is it so hard to resist?
Because our environment is practically designed to allow us to effortlessly give in to our cravings. When we have the overwhelming desire to devour a chocolate bar, it’s usually not that difficult to find one.
Many of us are surrounded by a huge selection of inexpensive and convenient foods and drinks available 24 hours per day, 7 days per week. How easy is it to grab a craveable snack within minutes?
When we buy them—if we don’t finish them right away—these craved foods make it home and are available to quickly grab from our purses, pantries, and fridges just in time for the next craving.
And that’s not all! Don’t forget that many processed foods have been specifically designed to satisfy our cravings and be “hyper-palatable.”[8] They’ve been tested and manufactured to have the optimal flavour, colour, texture, mouthfeel, etc. The idea is to really get the brain’s (neurological) reward system going.
Why do we have food cravings?
Even though the food environment described above is a human-made, fairly recent phenomenon, science tells us that cravings are deeply biological. So, why do we have them? The answer is: for survival.
Throughout the vast history of humankind, our survival depended upon our motivation to find food and sustenance to satisfy our hunger. But, our cravings go deeper than that. Food cravings point to specific types of foods: sweet, high-fat, starchy, or fast foods. These are foods that can give us a lot of energy right away (sweet, starchy) and foods that can sustain us for a longer time (high-fat).
Having quick sources of energy to fight or flee can help us survive immediate threats. While foods with the energy we can easily store for the long run can help us survive droughts and famines. We don’t really crave low-sugar, low-starch, low-fat foods (like kale) that much, do we?
Of course, vegetables are full of fibre and nutrients and I highly recommend getting these into your diet every day. It’s just that our natural tendency isn’t to go out of our way to seek those out. For the most part, we just don’t crave them.
It’s really no wonder that convenient access to a variety of craved foods isn’t helping us manage our cravings.
Stress relief is another reason we experience food cravings. Studies show that physical or emotional distress can increase intake of highly craved foods. Stress hormones, hunger hormones, and insulin, may all play a role.[9] That’s why when you’ve got a busy week with multiple deadlines, you often desire the cheesecake, chocolate and biscuits even more than usual. Then, when the craved food is consumed, the parts of the brain that process stress seem to calm down a bit.
Let’s weigh both the physical and emotional aspects of food cravings
There are two main schools of thought as to why we have food cravings: the deficiency hypothesis and the conditioning hypothesis. You’ve probably heard of and experienced both.
1 – Deficiency hypothesis (based on physical needs)
The idea behind the deficiency hypothesis is that when we have a physical need for a specific nutrient or food, our brain tells us to get it. It’s as though our body senses that we’re deficient and needs to replenish, so we crave the foods to get more of that missing nutrient.
2 – Conditioning hypothesis (based on habits or emotional needs)
The idea behind this hypothesis is that we are psychologically and behaviourally conditioned to want certain foods when we feel certain emotions or are in a certain environment. That it’s our feelings and habits that drives us to crave a food.[2] For example, if you’re used to snacking when watching TV or a movie, you may crave popcorn during those times simply because you’re in front of a screen, and not because you’re low in sodium. Another example is “comfort foods” that we may crave when we’re feeling out of sorts and want to relive a previous time in our lives where we felt comforted and happy.
Which one of these hypotheses has a bigger influence?
As we know, the human body, with its complex physiology and emotions is rarely well-understood using simple either/or explanations.
Recent studies show that both of these play a role (there is evidence for both), but one of them seems to have a stronger influence than the other.
Based on a large recent review of eight studies, researchers found more evidence to support the conditioning hypothesis. In this case, people who resisted food cravings for 12+ weeks found that their food cravings got (a bit) smaller.[1,2]
FUN FACT: Guess which craving dropped the most? The craving for sweets!
Even though this review of eight studies found that food cravings may be reinforced mostly by our emotional needs and behaviours, this doesn’t mean that our physical needs don’t play any role. They do—and other research shows this. For example, reducing certain macronutrients (e.g., fat and/or carbs) may not reduce cravings for high-fat or high-carb foods—they were still craved.
All together, this means that there is still some element of the deficiency hypothesis that plays a role.[1,2] It’s just that the role that nutrient deficiencies play in our food cravings is probably smaller than the role that our emotions and behaviours play.
The bottom line is that food cravings are “a complex bio-psycho-social phenomenon that cannot be fully explained using a simple psychological model alone.”[1]
Cravings also seem to “hijack” our brain’s reward centre. When you take a bite of that cookie, it feels good! This feeling drives us to continue trying to satisfy the craving over and over again so we can feel good over and over again.[2]
This brings us back to our food environment. If we know that foods we love are easy to get, our brains “light up” more when we think about them, rather than foods that are not as easily accessible.[5]
Conclusion
Now you know food cravings are a normal part of being a human. They’re part of our natural physiology and that makes them very difficult to change.
We live in an environment that promotes multiple food cues every day and gives us easy access to craveable foods. Together, these take advantage of our natural tendencies to crave certain foods.
Cravings come partly from our body’s physical need for nutrients, but recent research shows that they’re even more influenced by our emotional needs and habits. And remember, if you believe you may have any nutrient deficiencies or any health conditions, speak with your healthcare professional for a proper diagnosis and treatment strategy.
Read Part 2 for 10 Honest (and Totally Doable) Science Backed Strategies to Finally Outsmart Your Food Cravings
Refrences:
1 – Kahathuduwa, C. N., Binks, M., Martin, C. K., & Dawson, J. A. (2017). Extended calorie restriction suppresses overall and specific food cravings: a systematic review and a meta-analysis. Obesity reviews: an official journal of the International Association for the Study of Obesity, 18(10), 1122–1135. https://doi.org/10.1111/obr.12566
LINK: https://www.ncbi.nlm.nih.gov/pubmed/28557246
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2 – Examine’s Nutrition Examination Research Digest. (2017, October). Can dieting actually suppress food craving? Issue 36. Retrieved from https://examine.com/nerd/article/can-dieting-actually-suppress-food-craving/
3 – van den Akker, K., Schyns, G., & Jansen, A. (2018). Learned Overeating: Applying Principles of Pavlovian Conditioning to Explain and Treat Overeating. Current addiction reports, 5(2), 223–231. https://doi.org/10.1007/s40429-018-0207-x
LINK: https://www.ncbi.nlm.nih.gov/pubmed/29963363
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4 – Harvard Health Publishing. (2019, June 24). Why people become overweight. Retrieved from
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10 – Harvard Health Publishing. (2017, June 5). Controlling what — and how much — we eat. Retrieved from https://www.health.harvard.edu/staying-healthy/controlling-what–and-how-much–we-eat
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