These Popular Takeaway Orders Secretly Raise Your Dehydration Risk

Dehydration is dangerous because your body relies on water to function properly. When you lose more fluids than you take in, your blood volume drops, causing blood pressure to fall and depriving organs of oxygen. Severe cases can quickly lead to life-threatening complications.

The primary dangers of untreated or severe dehydration include:

• Hypovolemic Shock: A plunge in blood volume causes a severe drop in blood pressure and a dangerous reduction of oxygen in the body.
• Organ Failure: Without enough fluids, organs like the kidneys can experience acute injury or complete failure, leading to waste buildup in the body.
• Electrolyte Imbalance: The loss of water also depletes vital minerals like sodium and potassium, which carry electrical signals. When these signals mix up, it can cause involuntary muscle contractions, seizures, or loss of consciousness.
• Severe Heat Illness: Dehydration impairs your ability to sweat and regulate your body temperature, which can quickly escalate to life-threatening heatstroke. 

For official guidelines on the warning signs of dehydration, prevention, and when to seek emergency care, review the comprehensive guide on Mayo Clinic. 

Takeaway Orders That Increase Dehydration Risk

A May 2026 report on fluid loss from takeaways found that donuts are the most dehydrating food you can order. A new study by Instant Hydration determined which takeaway leaves you thirstiest by analyzing sodium, caffeine, sugar, and water content across 34 popular orders.

Key Findings

• Donuts rank as the most dehydrating takeaway item, driven by 20.5 grams of sugar and very low water levels at 24%, with chocolate brownies following close behind.
• Mozzarella sticks, garlic naan, and chicken quesadillas round out the top five, all packing high levels of sodium that force the body to pull water from its own reserves.
• Coffee and tea-based drinks sit in the moderate risk tier, with the caffeine acting as a mild diuretic and sugar adding a little to the fluid deficit.

The study evaluated each item using a four-factor scoring system based on its content. Sodium raises the body’s need for water, as kidneys require fluid to flush out excess salt. Caffeine can increase urine output at higher concentrations. Sugar creates an osmotic effect, drawing water into the gut during digestion. Low water content provides little compensatory hydration. Items scored up to 3 points per factor, with a maximum of 12. Higher scores mean greater dehydration risk.

The 10 Most Dehydrating Takeaway Orders

You can access the complete research findings here.

A Closer Look at the Top 5 Dehydrating Takeout Orders

1. Donuts ❌

• Dehydration Risk Score: 8/12
• Risk Tier: Very high
• Main Risk Driver: Sugar + dry texture
• Sodium: 487mg
• Sugar: 20.5g
• Water content: 24%

Donuts are the most dehydrating takeaway item you can order. A typical donut contains about 20 grams of sugar, which pulls water into the gut during digestion, and there is almost no moisture to offset the sugar load. There is a lot of sodium in donuts, too, with 487 milligrams, adding another layer of dehydration because of saltiness. Donuts are light, sweet, and easy to eat quickly, which is exactly the problem. 

2. Chocolate Brownies ❌

Chocolate brownies rank second for dehydration risk. They contain almost 40 grams of sugar, roughly double the sugar of a donut, and the water content is just 15%, one of the lowest among all foods studied. There is less sodium in brownies (289 milligrams), but the combination of extreme sugar concentration and almost no moisture means brownies create a significant fluid deficit.

3. Mozzarella Sticks ❌

Mozzarella sticks take third place on increasing the risk of dehydration. They contain 861 milligrams of sodium in every serving, one of the highest levels in the study, and the water makes up only 38%. The sugar content is very low, so the dehydration risk comes almost entirely from salt. Mozzarella sticks are salty, greasy, and stretchy, and each bite delivers a concentrated dose of sodium that forces your kidneys to pull water from your bloodstream.

4. Garlic Naan ❌

Garlic naan ranks fourth, with 810 milligrams of sodium, while water is almost absent, at just 36%. Plus, naan is often eaten alongside rich, salty curries, so the overall salt load from a full takeaway meal can be extreme. The bread itself is already a sodium bomb.

5. Chicken Quesadilla ❌

Chicken quesadilla rounds out the top five, with 745 milligrams of sodium per serving. The tortilla, the cheese, and the seasoned chicken all contribute to the salt load, and the griddled cooking process drives out moisture. A quesadilla looks like a light meal, but the sodium level is comparable to a fast-food burger. Also, the quesadilla often comes with sour cream and salsa, which add even more sodium without adding meaningful water.

A wellness expert from Instant Hydration commented on the topic:

“Your body has a limited supply of water at any given moment. When you eat a donut, your gut pulls water from your bloodstream to dilute the sugar. When you eat mozzarella sticks, your kidneys pull water from your cells to flush out the salt. And when you eat a heavy takeaway meal, both processes happen at the same time with no new water coming in. That’s why you feel tired and foggy after eating. You are dehydrated, not just full. The solution couldn’t be simpler. Drink water with your food. Not soda. Not sweet tea. Water.”

This article was created at the WHN News Desk in collaboration with Grace Perry on behalf of Instant Hydration, with 7x the electrolytes of leading sports drinks, their premium formula — powered by naturally superior sel gris — gives your body & mind everything it needs to perform at your peak, instantly. 

As with anything you read on the internet, this article should not be construed as medical advice; please talk to your doctor or primary care provider before changing your wellness routine. WHN neither agrees nor disagrees with any of the materials posted. This article is not intended to provide a medical diagnosis, recommendation, treatment, or endorsement. Additionally, it is not intended to malign any religion, ethnic group, club, organization, company, individual, or anyone or anything. These statements have not been evaluated by the Food and Drug Administration.