Nutrition and hydration can impact a medical student's well-being during school. There are various parts to a healthy diet that aid in helping students stay both mentally and physically sharp. Understanding the recommended daily intake and relating it to common portions can better inform students, so that they can keep up with their healthy habits throughout the day.
According to the organizations such as the Mayo Clinic and World Health Organization, nutritional health focuses on carbohydrates, sugars, fats, protein, electrolytes, vitamins, and minerals. This review will summarize their recommendations based on sources, serving sizes, and other factors. It will also cover dietary fiber, a critical part of gut health. For conversion purposes, a large reusable water bottle is typically 32 fluid ounces, or 4 cups. Understanding the serving sizes becomes more manageable when thinking about it from the perspective of an item you may fill daily.
| Macronutrient (Daily Recommended Intake) | Sources and Examples |
| Carbohydrates (2 cups per day or about ½ reusable large 32 oz water bottle) | Whole grains, vegetables, fruits and pulses (Unprocessed maize, millet, oats, wheat, brown rice, lentils, chickpeas, beans, dried peas, quinoa, oats, buckwheat, bananas, sweet potatoes, oranges, blueberries) |
| Fats and Oil (2-3 servings of fat or oil per day or about 9 teaspoons) | Unsaturated Fats (preferred): Fish, avocado, nuts, sunflower seeds, soybean, canola, olive oil Saturated Fats (not preferred): Fatty meat, butter, palm/coconut oil, cream, cheese, ghee, lard Trans Fat (not preferred): Baked/fried foods, pre-packaged snacks/food (frozen pizza, pies, cookies, biscuits, wafers, cooking oils) |
| Protein (5.5oz (about ⅕ large 32 oz water bottle) | Legumes, nuts, fish, other seafood, dairy products, meat |
| Fiber (25g - 30g) | Fruits: Raspberries, pears, apples, bananas, oranges, strawberries Vegetables: Green peas, broccoli, Brussels sprouts, carrots Grains: Spaghetti, barley, bran flakes, quinoa, oatmeal, bread Legumes, nuts, and seeds: Split peas, lentils, black beans, chia seeds, almonds, pistachios, sunflower seeds |
| Water (12-16 cups or 4 large 32 oz reusable water bottles) | Water |
| Micronutrients (Daily Recommended Intake) | Sources and Examples |
| Vitamin A (700 mcg -900 mcg or 2,333-3,000 IU) | Cantaloupe, carrots, dairy products, eggs, cereal, green leafy vegetables (for example, spinach) |
| Vitamin B1 (1.1 mg-1.2 mg) | Beans, peas, bread, cereal, pasta, rice, nuts, pork, sunflower seeds, whole grains |
| Vitamin B2 (1.1 mg-1.3 mg) | Eggs, bread, cereal, pasta, rice, meat, milk, poultry, spinach |
| Vitamin B3 (14 mg-16 mg) | Beans, beef, bread, cereal, pasta, rice, nuts, pork, poultry, whole grains |
| Vitamin B5 (5 mg) | Avocados, beans, peas, broccoli, eggs, milk, poultry, whole grains |
| Vitamin B6 (1.3 mg) | Chickpeas, fruits, potatoes, salmon, tuna |
| Vitamin B9 (400 mcg) | Asparagus, avocado, beans, peas, green leafy vegetables (ex. Spinach) |
| Vitamin B12 (2.4 mcg) | Dairy, eggs, cereal, meat, poultry, seafood |
| Vitamin C (75 mg-90 mg) | Fruit (cantaloupe, citrus, strawberries), orange juice, vegetables (ex. Broccoli, Brussels sprouts, peppers, tomatoes) |
| Iron (8 mg-18 mg) | Beans, peas, lentils, eggs, fruits, green vegetables (ex. Asparagus, broccoli, spinach), meat, nuts, poultry |
| Magnesium (310 mg-400 mg) | Avocados, beans, peas, dairy products, bananas, spinach, nuts |
| Zinc (8 mg-11 mg) | Beans, peas, beef, dairy products, cereal, nuts, poultry, whole grains |
According to the Mayo Clinic, the recommended maximum daily intake of caffeine is 400 mg. A typical energy drink tends to be about 150 mg to 200 mg, a cup of coffee is about 95 mg, and a cup of matcha is around 30 mg to 70 mg. Symptoms of excess caffeine usage include headache, insomnia, nervousness, irritation, increased urination, increased heartrate, tremors, and upset stomach. Students utilizing caffeine beverages and other sources to relieve their feelings of fatigue and exhaustion should be wary of these symptoms as they may be signs of excess caffeine. Students experiencing headaches without caffeine may be experiencing caffeine withdrawal.
As medical students, it can be difficult to ensure proper nutrition and hydration during meals. Factor in long study hours, busy school schedules, and feelings of exhaustion, adequate nutrition and hydration tend to be left out of our priorities and we overutilize sources of caffeine to keep us strong. While there are plenty more aspects to dietary supplementation, these are the most common and most easily accessible sources of nutrition that have shown to impact a person’s energy, fatigue, and cognition. Being aware of dietary recommendations and intake is important for ensuring staying in strong mental and physical well-being, so students can continue to study at school and attend their rotations in top shape.
References
FDA. (2021, October). Interactive Nutrition Facts Label. https://www.accessdata.fda.gov/scripts/interactivenutritionfactslabel/assets/InteractiveNFL_Vitami%20ns&MineralsChart_October2021.pdf (link no longer active)
Mayo Foundation for Medical Education and Research. (2025a, February 21). Caffeine: How much is too much?. Mayo Clinic. https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/caffeine/art-20045678
Mayo Foundation for Medical Education and Research. (2025b, December 23). Chart of high-fiber foods. Mayo Clinic.
https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/high-fiber-foods/art-20050948
Mayo Foundation for Medical Education and Research. (2026, January 21). Water: How much should you drink every day?. Mayo Clinic. https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/water/art-20044256
Suggested servings from each food group. www.heart.org. (2024, August 29). https://www.heart.org/en/healthy-living/healthy-eating/eat-smart/nutrition-basics/suggested-servings-from-each-food-group
Tardy, A.-L., Pouteau, E., Marquez, D., Yilmaz, C., & Scholey, A. (2020). Vitamins and minerals for energy, fatigue and cognition: A narrative review of the biochemical and clinical evidence. Nutrients, 12(1), 228. https://doi.org/10.3390/nu12010228
Vitamins and minerals • the nutrition source. The Nutrition Source - Harvard Chan School. (2025, November 24). https://nutritionsource.hsph.harvard.edu/vitamins/
World Health Organization. (2026, January 26). Healthy diet. World Health Organization. https://www.who.int/news-room/fact-sheets/detail/healthy-diet
