Jeffrey Salazar
Dehydration is a condition in which the body loses more fluid than it takes in, resulting in a lack of water and other fluids necessary for normal bodily functions. While there are many causes of dehydration, such as fever, vomiting, diarrhea, and sweating, some diets may also increase the risk. Restrictive diets, such as high-protein, keto, and intermittent fasting plans, can lead to dehydration if not properly managed. This is because certain foods or food groups that provide hydration are eliminated, and adequate fluid intake is not maintained. As a result, those following these diets may experience symptoms of dehydration, such as headaches, fatigue, and dizziness, and may need to pay closer attention to their fluid intake to stay properly hydrated.
Does diet cause dehydration?
| Characteristics | Values |
|---|---|
| Diets causing dehydration | Keto, high-protein, and intermittent fasting |
| Dehydration risk factors | Restrictive diets, especially those eliminating fruits or other food groups |
| High-protein diets and dehydration | Large amounts of protein cause the body to flush out nitrogen with fluids and water |
| Dehydration symptoms | Thirst, fatigue, dizziness, headache, nausea, vomiting, disorientation, low blood pressure |
| Dehydration treatment | Mild: oral fluid intake; Moderate: IV fluids; Severe: Seek medical attention |
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High-protein diets
The body requires more water to avoid dehydration when consuming a high-protein diet due to an increase in solute excretion, such as urea and other nitrogenous wastes. This places an increased strain on the kidneys, which need to remove these waste products from the body. The risk of dehydration is heightened because individuals on high-protein diets may not feel thirstier, and therefore may not increase their fluid intake to meet the body's needs.
The recommended daily allowance of protein varies depending on age, sex, pregnancy, nursing, and activity levels. For adults with minimal physical activity, the recommended daily allowance is around 2 grams of protein per kilogram of body weight, although some sources recommend no more than 0.8 grams. The Victorian Government's Better Health Channel recommends 0.75 grams of protein per kilogram of body weight for adult women, 0.84 grams per kilogram for adult men, and 1 gram per kilogram for men and women over 70.
While high-protein diets are popular for weight loss and muscle building, it is important to be mindful of potential health risks. Consuming too much protein may negatively affect health and has been linked to digestive issues, blood vessel problems, renal dysfunction, and loss of bone mass. It is recommended to consult a dietitian to monitor protein intake and create a suitable eating plan to avoid potential health complications.
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Intermittent fasting
Dehydration is a condition in which an individual loses so much body fluid that their body can't function normally. This can happen when someone doesn't drink enough water or loses water quickly through sweating, vomiting, or diarrhea.
While intermittent fasting can be beneficial for some, it also has some potential side effects, including dehydration. Dehydration during intermittent fasting is caused by a loss of water and salt through urine, especially during the first few days of fasting. Dark-colored urine is a sign of dehydration, and individuals experiencing dehydration may also feel dizzy, fatigued, or have a headache. To prevent dehydration, it is important to monitor fluid intake and increase water consumption during fasting periods.
It is important to note that any restrictive diet may cause dehydration, especially if it eliminates fruits or other food groups that provide hydration. Additionally, high-protein diets can lead to dehydration as the body flushes out excess nitrogen with fluids and water. Therefore, it is crucial to pay attention to your body and increase water intake as needed when trying intermittent fasting or any other diet.
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Restrictive diets
Dehydration is a condition in which the body loses more fluid than it takes in, resulting in a lack of sufficient water for normal bodily functions. While anyone can become dehydrated, certain diets, particularly restrictive ones, can increase the risk.
Keri Gans, a registered dietitian nutritionist, states that any restrictive diet may cause dehydration. Restrictive diets that eliminate entire food groups, such as fruits, can further increase the risk of dehydration. Intermittent fasting, a popular dietary approach that involves alternating between fasting and eating, can lead to dehydration if individuals forget to drink enough water. This is especially true for dry fasting, a type of intermittent fasting that restricts both food and liquids.
High-protein diets are also linked to dehydration. Consuming large amounts of protein causes the body to flush out excess nitrogen, leading to increased fluid loss. As a result, those on high-protein diets must pay close attention to their hydration levels and ensure adequate water intake.
Other diets that may contribute to dehydration include the ketogenic (keto) diet. Additionally, certain medications, weather conditions, and illnesses can impact dehydration risk.
It is crucial to prioritize hydration and recognize the signs of dehydration, such as headache, fatigue, and dizziness. The National Academy of Sciences recommends that men consume about 15 cups of fluids daily, while women should aim for 11 cups. However, a balanced diet that includes water-rich foods can help meet these requirements.
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Diuretics
Older individuals are more susceptible to dehydration as they are more likely to be taking diuretics and their body's thirst response decreases with age.
If you are taking diuretics, it is important to monitor your hydration levels and increase your fluid intake to prevent dehydration.
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Hot weather
Dehydration is a condition in which a person loses so much body fluid that their body can't function normally. The human body is made up of nearly 60% water, with the brain consisting of about 85% water. During hot weather, the body's natural cooling system may begin to fail, causing a person's internal temperature to rise to dangerously high levels, resulting in heat stroke.
Hot and humid weather increases the amount of sweat and fluid lost, and babies, small children, and older adults are particularly vulnerable to the effects of heat. Children in cars are especially vulnerable, as cars can heat up very quickly. Other factors that increase the risk of dehydration in hot weather include illness, certain medications, and vigorous physical activity.
To prevent dehydration in hot weather, it is important to drink plenty of fluids, especially water, before you get to the stage of feeling thirsty. Sports drinks, oral rehydration solutions, and water-rich fruits and vegetables can also help maintain hydration levels. It is recommended to avoid caffeinated and alcoholic beverages, as these can be dehydrating.
Other ways to prevent dehydration in hot weather include:
- Spending time in air-conditioned spaces and using fans in unairconditioned areas
- Wearing lightweight, loose-fitting clothing in light colours
- Avoiding the sun during the middle of the day and seeking shade
- Protecting the skin with sunscreen and a hat
- Wetting the skin periodically and soaking the feet in water
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Frequently asked questions
Dehydration is a condition in which the body loses more fluid than it takes in, causing the body to not have enough water to function normally.
Dehydration can be caused by a variety of factors, including not drinking enough water, diarrhoea, vomiting, fever, sweating, certain medications, and overexertion.
Yes, certain diets can increase the risk of dehydration. Restrictive diets, such as the keto diet, high-protein diets, and intermittent fasting, may lead to dehydration. This is because they may eliminate certain food groups, such as fruits, which are a source of hydration.
To prevent dehydration, it is important to ensure adequate fluid intake. The National Academy of Sciences recommends 15 cups of fluids per day for men and 11 cups per day for women. It is also important to pay attention to your body's thirst cues and drink before you get thirsty, as thirst is a sign of mild dehydration.
