Why Am I Always Hungry? Common Causes and What Helps

If you are always hungry, the most common reasons are meals low in protein or fiber, a diet heavy in ultra-processed foods, eating quickly, short sleep, stress and recent dieting. Most of these are fixable with everyday changes. In a controlled NIH study, people offered ultra-processed meals ate about 500 more calories a day than when offered unprocessed meals matched for sugar, fat, fiber and salt (Hall and colleagues, 2019). This guide covers why you might feel hungry even after eating, why you can be always hungry and tired, what helps, and when constant hunger is worth a doctor's visit.

It is educational, not medical advice.

Key Takeaways

• Food quality matters: ultra-processed meals led to about 508 more calories eaten a day in a 4-week inpatient study (Hall and colleagues, 2019).
• Protein fills you up: higher-protein meals increase fullness and the hormones that signal it (Leidy and colleagues, 2015).
• Sleep and stress count: short sleep raised hunger by 24% in one study (Spiegel and colleagues, 2004), and stress pushed some women toward eating more (Epel and colleagues, 2001).
• Slow down: eating slowly cut how much women ate at a meal while leaving them more satisfied (Andrade and colleagues, 2008).

Why Am I Always Hungry? 7 Common Causes

1. Not enough protein

Higher-protein meals increase fullness and raise the gut hormones that signal it (Leidy and colleagues, 2015). A breakfast of toast and juice or a lunch of plain pasta can leave you hungry again within a couple of hours.

2. A diet heavy in ultra-processed foods

In a study at the NIH Clinical Center, 20 adults lived on the ward for 4 weeks, eating either ultra-processed or unprocessed meals for 2 weeks each and as much as they wanted. On the ultra-processed diet they ate about 508 more calories a day and gained weight; on the unprocessed diet they lost weight (Hall and colleagues, 2019). Whole foods with fiber, like vegetables, beans, fruit and whole grains, take longer to eat and digest.

3. Eating too fast

In a randomized study of 30 healthy women, eating a meal slowly meant they ate less (about 579 vs 646 calories) yet felt more satisfied afterward than when they ate quickly (Andrade and colleagues, 2008). Fullness signals take time to reach the brain.

4. Short sleep

Two nights of short sleep in healthy young men raised the hunger hormone ghrelin by 28%, lowered the fullness hormone leptin by 18% and increased hunger by 24% (Spiegel and colleagues, 2004). Our guide to ghrelin and leptin explains how these hormones work.

5. Stress

In a lab study of 59 healthy women, those whose cortisol rose most during a stressful task ate more calories afterward and chose more sweet food (Epel and colleagues, 2001). Stress hunger often shows up as cravings rather than true hunger.

6. Recent dieting

After diet-induced weight loss, ghrelin levels rose by 24% in one study (Cummings and colleagues, 2002). Cutting calories hard makes your body push hunger up, which is why crash diets are hard to keep.

7. Long gaps between meals

Skipping meals can leave you ravenous later and more likely to reach for whatever is quickest. Regular meals that include protein make hunger more predictable.

Fullness signals travel from the gut to the brain through hormones and the vagus nerve; our guide to the gut-brain axis explains how.

If short nights are part of the picture, read does lack of sleep cause weight gain? for what sleep studies found about appetite.

Why Do I Feel Hungry Even After Eating?

Usually because the meal did not trigger strong fullness signals: it was low in protein or fiber, mostly ultra-processed, or eaten quickly (Leidy and colleagues, 2015; Hall and colleagues, 2019; Andrade and colleagues, 2008). Short sleep the night before makes it worse (Spiegel and colleagues, 2004). Try adding a palm-sized portion of protein and a serving of vegetables to the same meal, and put your fork down between bites.

Always Hungry and Tired: What It Can Mean

Being hungry and tired together most often points to short sleep, which raises hunger and the appetite for high-carbohydrate foods (Spiegel and colleagues, 2004). Adults need 7 or more hours a night; our guides to how to fall asleep fast and how to wake up when you are tired can help. If you are sleeping enough and still exhausted and hungry, see a doctor.

How to Stop Being Hungry All the Time

• Build each meal around protein (Leidy and colleagues, 2015).
• Choose mostly whole, minimally processed foods (Hall and colleagues, 2019).
• Eat slowly and stop for a moment halfway through (Andrade and colleagues, 2008).
• Sleep 7 or more hours (Spiegel and colleagues, 2004).
• Have a plan for stress, like a short walk, before reaching for a snack (Epel and colleagues, 2001).
• Avoid crash diets; steady changes are easier to keep (Cummings and colleagues, 2002).

If sweets are the main problem, our guide to how to stop sugar cravings goes step by step, and natural appetite suppressants covers foods and supplements studied for appetite.

Supplements and Fullness: What Research Shows

OEA (oleoylethanolamide) is a fat-derived compound your small intestine makes after you eat, and it is one of the body's own fullness signals. In a 60-day placebo-controlled trial in 60 adults with obesity, 250 mg of OEA a day reduced hunger and the desire to eat and increased fullness compared with placebo (Laleh and colleagues, 2018). Supplements work best on top of the habits above, not instead of them.

Our OEA Supplement provides 200 mg of OEA per two-capsule serving with PEA, L-theanine, acetyl-L-carnitine and green tea extract, for satiety support. Our Berberine Blend provides 500 mg of berberine, 300 mg of Ceylon cinnamon, 100 mg of bitter melon extract and 250 mcg of chromium picolinate per two-capsule serving. The Metabolic Stack combines both with Enhanced NMN. Learn more on our OEA ingredient page and our metabolic health and energy balance hub. Talk to your doctor before taking berberine or chromium if you take medicine that lowers blood sugar, and before starting any supplement if you are pregnant or breastfeeding.

When to See a Doctor

Constant hunger can sometimes be a sign of a medical problem, such as high blood sugar or an overactive thyroid, or a side effect of some medicines. See a doctor if your hunger comes with unusual thirst, passing urine more often, weight loss or gain you cannot explain, a racing heart, shakiness or constant tiredness, or if it started after a new medicine. A simple blood test can check your blood sugar and thyroid.

Frequently Asked Questions

Why am I always hungry even after eating?

Most often the meal was low in protein or fiber, ultra-processed, or eaten quickly (Leidy and colleagues, 2015; Hall and colleagues, 2019; Andrade and colleagues, 2008).

Why am I always so hungry all of a sudden?

Short sleep, stress, a new exercise routine or a recent diet are common reasons (Spiegel and colleagues, 2004; Cummings and colleagues, 2002). If it comes with thirst, weight change or tiredness, see a doctor.

Why am I always hungry and tired?

Short sleep raises hunger and lowers the fullness hormone leptin (Spiegel and colleagues, 2004). If you sleep enough and still feel this way, see a doctor.

Does eating slowly help with hunger?

Yes. In one study, eating slowly meant women ate less and felt more satisfied (Andrade and colleagues, 2008).

What foods keep you full the longest?

Meals built around protein, with vegetables, beans or whole grains, and few ultra-processed foods (Leidy and colleagues, 2015; Hall and colleagues, 2019).

Can stress make you hungry?

Yes. Women with a bigger cortisol response to stress ate more and chose more sweet food in one study (Epel and colleagues, 2001).

Why am I hungrier after losing weight?

Ghrelin, the hunger hormone, rose 24% after diet-induced weight loss in one study (Cummings and colleagues, 2002).

Is being hungry all the time a sign of something serious?

Usually not, but see a doctor if it comes with thirst, frequent urination, weight change you cannot explain or constant tiredness.

Sources

• Hall KD, Ayuketah A, Brychta R, et al. Ultra-processed diets cause excess calorie intake and weight gain: an inpatient randomized controlled trial of ad libitum food intake. Cell Metab. 2019. PubMed 31105044
• Leidy HJ, Clifton PM, Astrup A, et al. The role of protein in weight loss and maintenance. Am J Clin Nutr. 2015. PubMed 25926512
• Andrade AM, Greene GW, Melanson KJ. Eating slowly led to decreases in energy intake within meals in healthy women. J Am Diet Assoc. 2008. PubMed 18589027
• Spiegel K, Tasali E, Penev P, Van Cauter E. Brief communication: Sleep curtailment in healthy young men is associated with decreased leptin levels, elevated ghrelin levels, and increased hunger and appetite. Ann Intern Med. 2004. PubMed 15583226
• Epel E, Lapidus R, McEwen B, Brownell K. Stress may add bite to appetite in women: a laboratory study of stress-induced cortisol and eating behavior. Psychoneuroendocrinology. 2001. PubMed 11070333
• Cummings DE, Weigle DS, Frayo RS, et al. Plasma ghrelin levels after diet-induced weight loss or gastric bypass surgery. N Engl J Med. 2002. PubMed 12023994
• Laleh P, Yaser K, Abolfazl B, et al. Oleoylethanolamide increases the expression of PPAR-alpha and reduces appetite and body weight in obese people: a clinical trial. Appetite. 2018. PubMed 29787831

These statements have not been evaluated by the Food and Drug Administration. This content is for education and is not medical advice. Our products are not intended to diagnose, treat, cure or prevent any disease. Talk with a healthcare provider before starting a new supplement if you are pregnant, breastfeeding or taking medication.