Ever wonder if you’re eating enough? Listen to your body. There are usually physical signs of not eating enough, like constant hunger or irritability.
Achieving and maintaining a healthy weight for your body can be challenging, especially in a society where food is constantly available.
But not getting enough calories can also be a concern — whether it’s due to intentional food restriction, decreased appetite, or other reasons.
In fact, undereating on a regular basis can lead to a number of mental, physical, and emotional health issues. We dive into 11 signs that you may not be eating enough.
To evaluate your weight, you may want to start with your body mass index (BMI). The
That said, BMI doesn’t take into account many factors that affect weight, which can vary from person to person.
According to the
Sex | Height (inches) | Weight (pounds) | Waist circumference (inches) |
---|---|---|---|
Males assigned at birth (MAAB) | 69 inches | 199.8 lb | 40.5 inches |
Females assigned at birth (FAAB) | 63.5 inches | 170.8 lb | 38.7 inches |
Still, researchers have determined that a waist circumference equal to or less than
However, these normal values were developed to apply only to white adults. The researchers cite alternative research that was developed to represent African American adults. These values were 76–78 cm or 29–30 inches.
With this research in mind, the average waist circumference values of American adults are actually too high.
So how do you know if you haven’t eaten enough?
If you’re significantly below any of the above values, it may mean you’re considered underweight. Anything above these values increases a person’s chances of developing various health problems, such as heart disease.
That said, being underweight doesn’t necessarily mean you’re not eating enough.
There are other reasons for excessive weight loss, such as heavy exercise, malabsorption, or other underlying health conditions. Reaching out to a doctor is the best way to determine whether you’re eating enough for your body’s needs.
SummaryYou might be considered underweight if your BMI or weight is too low, according to national guidelines. But there are many factors that influence weight, and this doesn’t necessarily mean you’re not eating enough.
When you don’t get enough calories, you’ll likely feel tired most of the time.
These values are just averages and can differ depending on your sex, age, and level of exercise.
The
If you’re consuming fewer calories than the lower limits, you might not be eating enough to sustain your energy throughout the day.
SummaryCalories from food give us energy. Eating too few calories can lead to fatigue due to insufficient energy.
If you’re noticing an increased amount of hair accumulating in your hairbrush or shower drain, it
An inadequate intake of calories, protein, biotin, iron, and other nutrients is a common cause of hair loss.
SummaryHair loss can sometimes happen if you’re not getting enough calories, protein, and other nutrients.
Being hungry all the time is one obvious sign that you’re not eating enough food, but it isn’t the only one.
Appetite and food cravings can increase in response to drastic calorie restriction. This is due to changes in levels of hormones that control hunger and fullness.
For example, in a
A 2021 study examining calorie restriction in humans found that restricting calories didn’t lead to a notable decrease in hunger or appetite. But it also didn’t lead to increased hunger or appetite in people who had a low appetite to begin with.
More research is needed to understand how reducing calories may affect hunger and appetite in humans.
What’s more, fasting has been shown to increase the production of cortisol, a stress hormone that has been linked to hunger and increased belly fat.
However, while calorie deprivation may have a hunger-increasing effect in some cases,
SummaryUndereating can cause hormonal changes that increase your hunger in order to make up for missing calories and nutrients. However, in the long term, you may start to feel less hunger and have fewer food cravings.
Undereating may interfere with someone’s ability to become pregnant.
The hypothalamus helps maintain your hormonal balance, including reproductive health. It receives signals from your body that let it know when hormone levels need to be adjusted.
Based on the signals it receives, the hypothalamus produces hormones that either stimulate or inhibit the production of estrogen, progesterone, and other hormones.
When your calorie intake or body fat percentage drops too low, these signals may become impaired, leading to changes in the number of hormones released.
Without the proper balance of reproductive hormones, pregnancy cannot take place. Amenorrhea — the medical term for no menstrual period for
If you are trying to conceive, make sure to consume a balanced diet with a good amount of calories for your body. This will help your hormones function properly and improve your chances of a healthy pregnancy.
SummaryConsuming too few calories can disrupt reproductive hormone signals, leading to challenges in getting pregnant.
If little things have begun to set you off, it could be related to not eating enough.
Irritability was one of several issues experienced by young men who underwent extreme calorie restriction as part of the
Research on mice has found that restricting calories by 60% or more could lead to various adverse effects, including irritability and other mood problems.
According to a 2023 study on mice with obesity, calorie deprivation may increase anxiety behaviors.
On the other hand,
So far, research on this topic has been conflicting and focused mainly on animals, so more research is needed to understand whether these same effects will occur in humans.
All that said, what affects our moods in terms of nutrition might be how much we eat and what we eat.
For instance, following the Mediterranean diet
SummaryNot getting enough calories and restrictive eating patterns have been linked to irritability and anxiety in some research, but it has been limited. More research on humans is necessary.
If you constantly feel cold, not eating enough food could be the cause.
Your body needs to burn a certain number of calories in order to create heat and maintain a healthy, comfortable body temperature.
Calorie restriction can lead to lower core body temperature. Overall, the more severely you slash calories, the colder you’re likely to feel.
SummaryConsuming too few calories can lead to a decrease in body temperature, as you need calories to create heat.
Infrequent bowel movements may be related to low calorie intake. This isn’t surprising since consuming very little food will result in less waste in your digestive tract.
Constipation is typically described as having fewer than three bowel movements per week or having small, hard stools that are difficult to pass. It’s
The researchers also cite an older study suggesting that eating enough can reduce the chance of constipation in children as well.
If you’re having problems with bowel regularity, it’s important to take a look at the amount of food you’re eating and evaluate whether you’re getting enough.
SummaryNot getting enough calories may be associated with constipation in women. This is partly due to less waste product in general, but also slower movement of food through the digestive tract.
This means that if you’re frequently sick, you might not be getting enough nutrients that are necessary for healthy immune system function.
Nutrients that are important for immune functioning include certain amino acids — arginine and tryptophan — as well as the following minerals and vitamins:
- zinc
- selenium
- vitamin A
- B vitamins including B1, B2, B3, and B12
- vitamin C
- vitamin D
SummaryIf you’re frequently getting sick, it may be related to undereating. Contact a doctor to determine if this is the cause or if something else might be affecting your immune system.
Children and adolescents who are not growing as expected might not be eating enough. In younger children, this is known as failure to thrive or delayed growth.
How much they eat and what they eat can
The
SummaryIf a child isn’t growing as expected, it might be from undereating. But delayed growth can also have other causes. Contact your child’s pediatrician for any concerns.
Not eating enough can negatively affect your skin. In some cases, it can cause the skin to thin, wrinkle, and even peel or tear.
The skin can also develop lesions, bruising, broken blood vessels under the skin, and even more significant bleeding under the skin called purpura.
A
Malnutrition is when your body is not getting all the nutrients it needs. This can be caused by not eating enough, but there can be other causes, such as underlying medical conditions.
There’s also some conflicting evidence that calorie restriction
SummaryNot eating enough may negatively affect the skin, but more research is needed to understand the relationship between calorie reduction and how it affects the skin.
Although overeating increases the risk of developing health problems, undereating can also affect your health. This is especially true with severe or long-term calorie restriction.
If you notice any of the signs above, consider if you’re eating enough and then contact a healthcare professional for advice.
To make sure you’re getting enough to eat, the
Still, everyone’s body is different. You can always reach out to a doctor or dietitian for advice on what will work best for you.
If you believe you aren’t eating enough and need extra support, you may want to reach out to a healthcare professional or organization like the National Alliance for Eating Disorders.