The Science of Being Hangry

• A. Jitteriness
• B. Hangry ✓
• C. Sluggishness
• D. Dizziness

Why: 'Hangry' is a blend of 'hungry' and 'angry' and describes the irritability that can come with low blood sugar and hunger.

• A. Liver
• B. Kidneys
• C. Brain ✓
• D. Skin

Why: The brain uses a large share of the body's glucose and has limited stored energy, so dips in blood sugar quickly affect its functioning and mood regulation.

• A. Insulin
• B. Melatonin
• C. Glucagon ✓
• D. Thyroxine

Why: Glucagon is released by the pancreas when blood glucose falls and prompts the liver to convert stored glycogen back into glucose.

• A. Increased lung capacity
• B. Shakiness and trembling
• C. Slower heart rate
• D. Dilated pupils only after exercise

Why: Shakiness, sweating, and rapid heartbeat are common early signs of low blood sugar, as the body reacts to the drop in glucose by releasing adrenaline.

• A. Sugar permanently raises blood glucose
• B. Rapid absorption can cause a sharp spike followed by a drop in blood sugar
• C. Sugar prevents the release of glucagon entirely
• D. Refined sugar has no effect on blood glucose

Why: Refined sugars are absorbed quickly, causing a spike and then a rapid fall in blood glucose, which can trigger hunger, fatigue, and irritability.

• A. The liver
• B. The brain ✓
• C. The heart
• D. The skeletal muscles

Why: The brain uses roughly 20 percent of the body's energy despite making up only about 2 percent of body weight, and it relies heavily on glucose as its primary fuel.

• A. Triglycerides
• B. Glycogen ✓
• C. Keratin
• D. Starch

Why: Glycogen is a branched polymer of glucose molecules that the body stores in the liver and muscles and can break back into glucose when blood sugar drops.

• A. Insulin
• B. Cortisol
• C. Glucagon ✓
• D. Thyroxine

Why: Glucagon is secreted by pancreatic alpha cells when blood glucose is low and stimulates the liver to break down glycogen and release glucose into the bloodstream.

• A. The brain's neurons temporarily lack sufficient fuel, impairing emotional regulation and impulse control ✓
• B. The stomach produces excess acid that causes mood changes
• C. Low blood sugar increases the production of red blood cells
• D. The kidneys flood the body with sodium, causing agitation

Why: When glucose supply to the brain drops, areas such as the prefrontal cortex, which helps regulate emotions and inhibit impulsive reactions, function less effectively, making irritability more likely.

• A. Refined white sugar
• B. Fruit juice
• C. Complex carbohydrates such as whole grains ✓
• D. Sports drinks

Why: Complex carbohydrates contain longer chains of sugar molecules and fiber that take longer to break down, releasing glucose gradually and helping avoid sharp blood sugar drops.

• A. Insulin
• B. Cortisol ✓
• C. Melatonin
• D. Oxytocin

Why: Cortisol is the primary glucocorticoid stress hormone. It is released by the adrenal cortex in response to signals from the hypothalamus and pituitary, mobilizing energy and preparing the body to respond to stress.

• A. It lowers blood glucose by driving glucose into muscle cells.
• B. It raises blood glucose by promoting gluconeogenesis and glycogen breakdown. ✓
• C. It has no effect on blood glucose levels.
• D. It converts fats directly into glucose in the bloodstream.

Why: Cortisol increases blood glucose by stimulating gluconeogenesis in the liver and promoting the breakdown of glycogen, providing quick energy for a stress response.

• A. Low blood sugar causes the brain to receive less glucose, which can impair mood regulation and self-control. ✓
• B. Low blood sugar causes an immediate increase in melatonin.
• C. Low blood sugar eliminates all cortisol from the bloodstream.
• D. Low blood sugar directly increases serotonin levels, causing agitation.

Why: The brain relies heavily on glucose for fuel. When glucose levels fall, cognitive functions including emotional regulation and impulse control can be impaired, contributing to irritability.

• A. Cortisol levels remain permanently at zero.
• B. Cortisol may become dysregulated, with disrupted daily rhythms and reduced responsiveness. ✓
• C. Cortisol production increases only during sleep.
• D. Cortisol is replaced entirely by adrenaline.

Why: Prolonged stress can disrupt the normal daily cortisol rhythm, which typically peaks in the morning and falls at night. This dysregulation can affect mood, energy, and irritability.

• A. Skipping meals to keep blood sugar stable.
• B. Eating regular, balanced meals with protein, fiber, and complex carbohydrates. ✓
• C. Consuming large amounts of simple sugar at once without eating other foods.
• D. Avoiding all carbohydrates entirely.

Why: Regular balanced meals with protein, fiber, and complex carbohydrates help maintain steadier blood glucose levels, reducing the sharp dips that can trigger irritability.

• A. Leptin
• B. Ghrelin ✓
• C. Insulin
• D. Cortisol

Why: Ghrelin is released mainly by cells in the stomach lining when it is empty and signals the brain that it is time to eat, which is why it is often called the 'hunger hormone.'

• A. The liver
• B. The pancreas
• C. Fat (adipose) tissue ✓
• D. The thyroid gland

Why: Leptin is produced mainly by fat cells. Its level in the blood roughly reflects how much body fat a person has, and it signals the brain about energy stores.

• A. It stimulates hunger right before meals
• B. It signals fullness and reduces appetite when energy stores are adequate ✓
• C. It breaks down stored glucose in the liver
• D. It raises blood pressure after eating

Why: Leptin acts on the hypothalamus in the brain to suppress appetite and increase energy expenditure when the body has sufficient fat stores.

• A. After a large meal
• B. During sleep only
• C. Before meals and when the stomach is empty ✓
• D. After intense exercise only

Why: Ghrelin levels rise when the stomach is empty and tend to peak just before usual mealtimes, then fall after eating.

• A. Leptin levels rise sharply, causing agitation
• B. Low blood sugar and rising hunger hormones can affect mood and self-control ✓
• C. Ghrelin directly lowers the production of serotonin in the brain only at night
• D. Hunger hormones have no effect on mood or brain function

Why: When blood sugar drops and hunger signals intensify, the brain's energy supply is reduced, which can impair mood regulation and self-control, contributing to irritability known as 'hangriness.'

• A. A physical injury caused by repetitive motion
• B. A decline in the quality of decisions after prolonged periods of decision-making ✓
• C. A medical condition that causes permanent loss of memory
• D. A preference for familiar foods over new ones

Why: Decision fatigue describes how the quality of judgment tends to decline after a long series of choices, leading people to take shortcuts, defer, or choose impulsively.

• A. A drop in blood glucose levels ✓
• B. An increase in body temperature
• C. A rise in blood pressure after exercise
• D. A surge in white blood cell count

Why: Low blood glucose reduces the brain's fuel supply, which can increase irritability and impair self-control, contributing to the hangry feeling.

• A. Hunger makes the brain prioritize quick energy and reward, favoring calorie-dense foods ✓
• B. Hunger causes the stomach to shrink, making people prefer smaller portions
• C. Hunger reduces the sense of smell, so people choose the first food they see
• D. Hunger increases the body's need for water, so people choose drinks over food

Why: When hungry, the brain's reward systems become more responsive to food cues, and the evolutionary drive for energy-dense foods pushes choices toward high-calorie options.

• A. It strengthens self-control by sharpening focus
• B. It has no measurable effect on self-control
• C. It makes people more generous but less patient
• D. It can weaken self-control, making impulsive choices more likely ✓

Why: Low energy states are associated with reduced inhibitory control, so hungry people are more prone to impulsive, short-term decisions.

• A. Waiting until you are very hungry before deciding what to eat
• B. Eating a balanced meal or snack at regular intervals ✓
• C. Making major purchasing decisions while exhausted
• D. Skipping meals to save calories for later

Why: Regular, balanced eating keeps blood sugar more stable, reducing the intensity of hunger and the impulsive decisions it can trigger.

• A. Cortisol
• B. Insulin ✓
• C. Adrenaline
• D. Glucagon

Why: Insulin is released by the pancreas after eating to help cells absorb glucose from the blood, which lowers blood sugar levels. Glucagon does the opposite, raising blood sugar.

• A. Fat
• B. Protein
• C. Glucose ✓
• D. Ketones only

Why: The brain depends heavily on glucose from the bloodstream as its primary energy source. When blood glucose drops too low, brain function, including mood regulation, can be impaired.

• A. Melatonin
• B. Serotonin
• C. Cortisol ✓
• D. Oxytocin

Why: Cortisol is a stress hormone that helps raise blood sugar when levels fall. Its increase can produce irritability, anxiety, and agitation, contributing to the hangry feeling.

• A. It stays perfectly flat for hours
• B. It rises quickly and may then drop sharply ✓
• C. It drops immediately before eating
• D. It rises slowly and never falls

Why: Refined carbohydrates are digested rapidly, causing a fast spike in blood sugar followed by an insulin-driven drop. This sudden decline can trigger shakiness, irritability, and mood swings.

• A. Sugary soda
• B. White bread alone
• C. Candy bars
• D. Protein and fiber-rich foods such as nuts or beans ✓

Why: Protein and fiber slow the digestion and absorption of carbohydrates, leading to a steadier release of glucose into the blood and reducing the likelihood of a sudden crash.

• A. Happy and angry
• B. Hungry and angry ✓
• C. Hot and angry
• D. Harried and angry

Why: 'Hangry' combines 'hungry' and 'angry' to describe irritability that arises when a person's blood sugar drops due to not eating for a while.

• A. Insulin
• B. Cortisol
• C. Ghrelin ✓
• D. Melatonin

Why: Ghrelin, often called the 'hunger hormone,' is released mainly by the stomach and rises before meals, signaling the brain that it is time to eat.

• A. It increases the amount of oxygen in your blood
• B. The brain relies heavily on glucose, so shortages can impair self-control and emotional regulation ✓
• C. It causes the body to produce more adrenaline only in the legs
• D. It eliminates all stress hormones from the bloodstream

Why: The brain uses a large share of the body's glucose. When supply dips, executive functions such as impulse control and emotional regulation can weaken, making irritability more likely.

• A. Simple sugary snacks like candy
• B. Plain white bread alone
• C. Protein and fiber-rich foods such as beans, nuts, or whole grains ✓
• D. Energy drinks with high caffeine

Why: Protein and fiber slow digestion and the release of glucose into the bloodstream, helping avoid the sharp spikes and crashes that come from quick sugars.

• A. Skipping lunch to save time
• B. Eating a large meal only once in the evening
• C. Having small, balanced snacks spaced every three to four hours ✓
• D. Relying on coffee instead of food

Why: Regular, balanced snacks spaced out through the day keep blood sugar and energy more even, reducing the chance of a sudden drop that triggers irritability.