Why Do I Get Shaky When I'm Hungry?

You skipped lunch, the afternoon dragged on, and now your hands are trembling, you feel sweaty and irritable, and you cannot think about anything except food. That jittery, hollow feeling is common, and for most people it is the body's alarm system doing its job.

Understanding that alarm makes it easier to prevent, and easier to spot when shakiness points to something that needs a doctor. Steady eating is one of the threads in our guide to nutrition and wellness. This article explains what is happening and what to do next, but it cannot diagnose the cause of your symptoms.

Why does hunger make you shaky?

Hunger shakiness usually happens because your blood glucose, the sugar in your blood that fuels your cells, is dropping. When it falls, your body releases adrenaline (also called epinephrine), a stress hormone that tells the liver to release stored sugar. Adrenaline is also what makes your hands tremble.

Your brain relies heavily on glucose, so the body guards blood sugar closely. Several hours after a meal, levels drift down, and hormones such as glucagon and adrenaline step in to bring them back up. The side effects of that rescue effort, shakiness, sweating, a pounding heart, and anxiety, are what you feel.

In people without diabetes, blood sugar rarely falls to truly low levels just from skipping a meal. Many people still feel these warning symptoms as levels drop toward the low end of normal, especially if they are sensitive to the adrenaline response.

What does low blood sugar feel like?

Low blood sugar, known medically as hypoglycemia, tends to cause two groups of symptoms. The first come from the adrenaline response. The second come from the brain not getting enough fuel, and they are more serious.

Early warning symptoms (adrenaline)	Later symptoms (brain short on fuel)
Shaky or trembling hands	Confusion or difficulty concentrating
Sweating, chills, or clamminess	Slurred speech
Fast or pounding heartbeat	Blurred or double vision
Anxiety, nervousness, or irritability	Clumsiness or poor coordination
Intense hunger	Unusual behavior or drowsiness
Tingling around the lips	Seizures or loss of consciousness (severe)

For people with diabetes, NIDDK defines low blood sugar as a level below 70 mg/dL. Everyday hunger shakiness in people without diabetes usually stays in the left column and fades soon after eating.

Why do some people get shaky and others do not?

People vary in how sensitive they are to falling blood sugar and how strongly their bodies respond with adrenaline. Some feel unwell after a few hours without food, while others barely notice a skipped meal.

Factors that may make hunger shakiness more likely include:

• Meal composition: a meal mostly of refined carbohydrates, such as white bread, sweets, or sugary drinks, is digested quickly and may leave you hungry sooner than one with protein, fiber, and fat.
• Long gaps between meals: skipping breakfast or lunch extends the time your body has to manage on its own reserves.
• Physical activity: exercise uses glucose, so a workout on an empty stomach can bring on symptoms.
• Alcohol: drinking without eating can block the liver from releasing sugar, which can lower blood sugar for hours.
• Caffeine: coffee on an empty stomach can add its own jitteriness to hunger.
• Smaller body size or high activity levels: less stored energy or higher needs can shorten the comfortable gap between meals.

Is it hunger, caffeine, or anxiety?

Several common causes produce similar shaky feelings, so context is the best clue. Hunger shakiness improves within about 15 to 20 minutes of eating, while caffeine and anxiety jitters usually do not.

Likely cause	Typical clues	What usually helps
Hunger or falling blood sugar	Several hours since eating, strong hunger, sweating	Eating a snack or meal
Too much caffeine	Recent coffee, energy drinks, or pre-workout; racing heart; trouble sleeping	Cutting back on caffeine
Anxiety or stress	Worry, tension, a sense of dread, happens whether or not you have eaten	Slow breathing, addressing the stressor, support
Diabetes medicine	On insulin or a sulfonylurea; missed or delayed meal	Fast-acting carbohydrate, then follow your care plan
Overactive thyroid	Ongoing tremor, weight loss, heat intolerance, fast pulse	Medical evaluation and blood tests

Coffee on an empty stomach is a common double hit. If you rely on several cups to get through the morning, the guide to how much caffeine is too much sets out the FDA's 400 mg daily figure for healthy adults and the signs you are overdoing it.

Anxiety can also produce trembling, a pounding heart, and sweating, and sometimes those symptoms feel alarming enough to raise fears about the heart. The comparison of panic attacks and heart attacks explains how to tell those apart and when to call 911.

What is reactive hypoglycemia?

Reactive hypoglycemia is low blood sugar that happens within about four hours after eating, rather than after a long fast. It is thought to occur when the body releases more insulin than needed after a meal, especially one heavy in refined carbohydrates, pushing blood sugar down afterward.

Symptoms are the same shaky, sweaty, hungry feelings. Some people notice a pattern of feeling energetic right after a sugary meal and then crashing a couple of hours later. A related experience, feeling sleepy after a big meal, has different causes that are covered in the article on why you feel tired after eating.

Reactive hypoglycemia is sometimes seen after some types of stomach surgery, including weight-loss surgery, and can occasionally be linked to prediabetes. If you notice this pattern regularly, your doctor can check your blood sugar and talk through whether testing makes sense.

What should you eat when you feel shaky?

If you feel shaky from hunger and do not have diabetes, eating a normal snack or meal is usually enough. Something with carbohydrate for quick fuel plus some protein or fat to make it last tends to work well.

Examples include:

• A piece of fruit with a handful of nuts or a spoon of peanut butter
• Whole-grain crackers with cheese
• Plain yogurt with berries
• A glass of milk and a slice of whole-grain toast
• Hummus with pita and vegetables

If you have diabetes

People with diabetes who take insulin or certain other medicines need a faster plan. NIDDK and the CDC describe the 15-15 rule: if your blood sugar is below 70 mg/dL, take 15 grams of fast-acting carbohydrate, such as 4 ounces of juice or regular soda or glucose tablets, then recheck after 15 minutes. Repeat if it is still low, and eat a snack or meal once it comes back up.

Follow the specific plan your care team has given you, since targets and treatments vary.

How can you prevent getting shaky between meals?

The most effective prevention is regular eating with balanced meals. For most people that means not going much longer than four to five hours awake without food, and building meals around protein, fiber, and some healthy fat rather than refined carbohydrates alone.

• Eat breakfast, or at least a small morning snack, if you tend to crash before lunch.
• Pair carbohydrates with protein or fat: an apple with cheese rather than an apple alone.
• Choose whole grains, beans, and vegetables, whose fiber slows digestion.
• Keep a portable snack in your bag, car, or desk.
• Eat something before or soon after a workout.
• Do not drink alcohol on an empty stomach.
• Limit sugary drinks, which digest fast and can set up a crash.

A practical template for meals that keep you going is the approach to building a balanced plate: half vegetables and fruit, a quarter protein, a quarter whole grains.

When should you see a doctor or call 911?

Call 911 if someone with shakiness becomes confused and cannot safely eat or drink, has a seizure, or passes out. Do not try to put food or liquid in the mouth of someone who is unconscious. People with diabetes who use insulin may have glucagon prescribed for exactly this situation.

Make an appointment with your primary care provider if you:

• Get shaky, sweaty, or lightheaded often, even when you eat regularly
• Have symptoms that do not improve within about 15 to 20 minutes of eating
• Have ever been confused, fainted, or had blurred vision with hunger
• Notice these episodes after weight-loss or stomach surgery
• Have symptoms of possible diabetes, such as increased thirst, frequent urination, or unexplained weight loss
• Have a tremor that is present all the time, not only when hungry
• Have diabetes and are having frequent lows

Your doctor may check your blood sugar, an A1C test (which reflects average blood sugar over about three months), and sometimes thyroid function. True low blood sugar in people without diabetes is uncommon and worth investigating when it does occur, because causes can include medicines, alcohol, hormone problems, and, rarely, tumors that make insulin.

Is getting shaky when hungry a sign of diabetes?

Not usually on its own. Most people who get shaky when hungry do not have diabetes, and the symptom alone is not a reliable sign of it. Diabetes more often shows up as high blood sugar, with thirst, frequent urination, fatigue, and blurred vision.

That said, a pattern of crashes after meals is sometimes seen in people with insulin resistance or prediabetes, conditions in which the body does not respond well to insulin. If you have risk factors such as a family history of type 2 diabetes, extra weight, or high blood pressure, it is reasonable to ask your doctor about screening.

For most people, the fix is simple: eat at regular intervals, balance meals, and keep a snack within reach. If that does not settle things, a visit to your primary care provider is the right next step.