Healthy Eating
29,483 members3,814 posts

9 Signs That You’re Not Eating Enough

9 Signs That You’re Not Eating Enough

By Franziska Spritzler, RD, CDE

June 5, 2017


chieving and maintaining a healthy weight can be challenging, especially in a modern society where food is constantly available.However, not eating enough calories can also be a concern, whether it’s due to intentional food restriction, decreased appetite or other reasons.In fact, under-eating on a regular basis can lead to a number of mental, physical and emotional health issues. Here are 9 signs that you’re not eating enough.

1. Low Energy Levels

Calories are units of energy your body uses to function.

When you don’t eat enough calories, you’re likely to feel tired most of the time.

The number of calories needed for these basic functions within a 24-hour period is referred to as your resting metabolic rate.Most people have a resting metabolic rate higher than 1,000 calories per day. Adding physical activity can increase your daily needs by another 1,000 calories or more.Although hormones also play a role in energy balance, generally if you take in more calories than needed, you will store most of the excess as fat. If you take in fewer calories than needed, you will lose weight.Restricting intake to fewer than 1,000 calories daily can slow down your metabolic rate and lead to fatigue since you’re not taking in enough calories to support even the basic functions that keep you alive.Eating too little has particularly been linked to low energy levels in older people, whose food intake may decrease due to reduced appetite.Yet even light physical activity like walking or taking the stairs may cause you to tire easily if your calorie intake is well below your needs.

2. Hair Loss

Losing hair can be very distressing.

It’s normal to lose several strands of hair daily. However, if you’re noticing an increased amount of hair accumulating in your hairbrush or shower drain, it may be a sign that you’re not eating enough.Many nutrients are needed to maintain normal, healthy hair growth.

Inadequate intake of calories, protein, biotin, iron and other vitamins and minerals is a common cause of hair loss.Basically, when you don’t take in enough calories and key nutrients, your body will prioritize the health of your heart, brain and other organs over hair growth.

3. Constant Hunger

Being hungry all the time is one of the more obvious signs that you’re not eating enough food.Studies confirm that appetite and food cravings increase in response to drastic calorie restriction due to changes in levels of hormones that control hunger and fullness .Calorie restriction may cause hunger and food cravings in both normal-weight and overweight individuals.What’s more, low calorie intake has been shown to increase production of cortisol, a stress hormone that has been linked to hunger and increased belly fat Essentially, if your calorie intake drops too much, your body will send signals that drive you to eat in order to avoid potential starvation.

4. Inability to Get Pregnant

Undereating may interfere with a woman’s ability to become pregnant.The hypothalamus and pituitary gland located in your brain work together to maintain hormonal balance, including reproductive health.The hypothalamus 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 production of estrogen, progesterone and other hormones by your pituitary gland.Research has shown that this complex system is highly sensitive to changes in calorie intake and weight .When your calorie intake or body fat percentage drops too low, signals may become impaired, leading to changes in the amount of hormones released. Without the proper balance of reproductive hormones, pregnancy cannot take place. The first sign of this is hypothalamic amenorrhea, or having no menstrual period for three months or longer.If you are trying to conceive, make sure to consume a well-balanced, adequate-calorie diet in order to ensure proper hormonal function and a healthy pregnancy.

5. Sleep Issues

Sleep deprivation has been found to lead to insulin resistance and weight gain in dozens of studies.In addition, while overeating may cause sleeping difficulty, it appears that strict dieting can lead to sleep problems as well.Feeling as though you are too hungry to fall asleep or waking up hungry are major signs that you’re not getting enough to eat.

6. Irritability

If little things have begun to set you off, it could be related to not eating enough.Indeed, irritability was one of several issues experienced by young men who underwent calorie restriction as part of the Minnesota Starvation Experiment during World War II.These men developed moodiness and other symptoms while consuming an average of 1,800 calories per day, which was classified as “semi-starvation” for their own calorie needs. Your own needs may be lower, of course.To keep your mood on an even keel, don’t let your calories drop too low.

7. Feeling Cold All the Time

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.In fact, even mild calorie restriction has been shown to lower core body temperature. Overall, the more severely you slash calories, the colder you’re likely to feel.Infrequent bowel movements may be related to inadequate 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 three or fewer bowel movements per week or having small, hard stools that are difficult to pass. This is very common in older people and can be worsened by poor diet.Dieting and eating too little food may also cause constipation in younger people due to a slowed metabolic rate.IIf you’re having problems with regularity, it’s important to take a look at the amount of food that you’re eating and evaluate whether you’re getting enough.

9. Anxiety

Although dieting itself may lead to moodiness, outright anxiety can occur in response to very low calorie intake.Anxiety has also been observed in overweight people who eat very low-calorie diets.To minimize anxiety while trying to lose weight, make sure you’re consuming enough calories and eating a healthy diet that includes plenty of fatty fish to ensure you’re getting omega-3 fatty acids, which may help reduce anxiety

The Bottom Line

Although overeating increases the risk of developing health problems, under-eating can also be problematic.This is especially true with severe or chronic calorie restriction. Instead, to lose weight sustainably, make sure to eat at least 1,200 calories per day.Additionally, be on the lookout for these 9 signs that you may need more food than you’re currently taking in.


9 Replies

I don't see anything there about the effects on hunger feelings of eating the wrong things. Essentially if the stomach is not full you feel hungry.

A great way to fill the stomach without putting weight on is with whole food plant based diet. This provides all calorific needs and yet leaves you feeling full.

If instead you attempt to fill the stomach with calorie-rich meats the stomach actually remains less than half full because of the inability for the human to consume large amounts of meat at one sitting. By comparison, if I remember by stats properly, a carnivorous animal can regularly consume almost a third of its body weight in meat at one sitting. Such an animal has hydrochloric acid as strong as battery acid in its stomach ideal for breaking down fats in meats without causing health issues such as atherosclerosis.

1 like

"A great way to fill the stomach without putting weight on is with whole food plant based diet. This provides all calorific needs and yet leaves you feeling full.


any details of wholeplant based food/diet?and calories of such food/diet

1 like

The diet I followed (from Apr 2016 until Jan 2017) to gain total recovery from my Rheumatoid Arthritis was the Paddison Program. This was recently analysed during its most restrictive phase (the baseline phase) and I think shows how nutritionally complete this program is.

Outside that restrictive phase it is almost impossible to avoid getting a nutritionally complete set of nutrients on a varied whole-food plant based diet. The only thing to watch is, if underweight get some more calories with such things as rice and grains or if overweight cut back on these - all depending on exercise regimes.

My exercise regime is daily Bikram yoga, with at least one day when I do a double.

1 like

I have followed the whole food plant based no oil diet for 18 months, am now slightly under weight but have never felt hungry. did not do it to lose weight but to improve my arteries which I hope it is doing.


With a diet like that it can do nothing else but help your arteries. Bye-bye atherosclerosis for now and forever. Well done.

Calories can be balanced by adding more calorific foods such as nuts or grains. See Jeff Novick's video

for some useful comparisons on calorific intake.

1 like

Many thanks for your reply. Are you in the UK ? so much of this info comes from the USA, it would be nice to find doctors in this country recommending it, the only one I have found is Patrick Holford.

1 like

Yes I am in the UK (Oxford). Here is a list of people in the UK who are nutritionists, rheumatologists, doctors, osteopaths, dieticians and so forth with a focus dietary solutions to health issues, mostly plant-based. I am sure if you google them you can find contact details.

Andrew Knight, Claire-Marie Thomas , Clare Crouch, Diana Anderson, Evangeline Koss, Gail Darlington, GIna Shaw, Jessica Manson, Jo Travers, Karen Cottenden, Laura Thomas, Charlotte Stirling-Reed, Lena Gobine, Michael Lingard, Natalie Davies, Nicholas Shenker, Nigma Ttalib, Ondrej Matej, Priya Tew, Theresa Webb, Xochi Balfour and Yvonne Bishop-Weston.

I run a monthly drop-in session in a local coffee bar (Eynsham Emporium) 4th Monday every month 11am, for anyone interested in my specialist subject - diet and arthritis. (Not that I actually drink coffee though I used to drink a litre/day!)

1 like

Interesting ty. As a former anorexic I can relate to many and still have to pay attention to my eating as I am prbe to eating disorders.


1 like

I'd be interested how you fare on a whole-food plant-based diet, esp a low-oils one. My guess is it could halt many of the issues of your eating disorders, but I have no evidence for that excepting how it is solving many of my health issues tat I did not even know I had!

1 like

You may also like...