College is the first time many students have full autonomy over their health decisions. No one is monitoring your sleep schedule, checking whether you ate breakfast, or telling you to put your phone down. That freedom is valuable, and it comes with responsibility. The choices you make about sleep, nutrition, exercise, substance use, and mental health during your undergraduate years have direct, measurable effects on your academic performance, your MCAT® preparation, your clinical experiences, and your medical school application. This page covers the evidence on each topic so you can make informed decisions.
Sleep and Academic Performance
The relationship between sleep and academic performance is one of the most consistent findings in educational research. College students who sleep fewer than 6 hours per night have lower GPAs, worse exam performance, and more difficulty retaining information than students who sleep 7 to 9 hours. Sleep deprivation impairs the hippocampus (critical for memory consolidation), reduces prefrontal cortex function (responsible for attention, decision-making, and executive function), and increases cortisol (the stress hormone). All-night study sessions are counterproductive: the memory consolidation that occurs during sleep is more valuable than the additional hours of study you gain by staying awake. Plan your study schedule so you can sleep 7 to 9 hours every night, including during exam periods. See our time management guide for strategies.
Substance Use in College
Alcohol: College drinking culture is pervasive, and binge drinking rates among college students are among the highest of any age group. Approximately 33 percent of college students report binge drinking in the past month. Beyond the well-known acute risks (accidents, sexual assault, alcohol poisoning), regular heavy drinking impairs the neurocognitive functions you need most as a pre-med student: memory consolidation, attention, executive function, and learning efficiency. A night of heavy drinking can impair cognitive performance for 24 to 48 hours afterward, which directly affects your academic performance during that window. You do not need to abstain entirely to be successful, but understanding the dose-response relationship between alcohol and cognitive impairment helps you make informed decisions about when, how much, and how often you drink.
Stimulant Misuse: Non-prescribed use of stimulant medications (amphetamine salts, methylphenidate) is common among pre-med students who believe these drugs enhance studying. The evidence does not support this belief for students without ADHD: stimulants increase alertness and subjective confidence but do not improve actual learning or long-term retention. They do increase heart rate, blood pressure, anxiety, and risk of dependence. If you are struggling with focus, the evidence-based interventions are sleep, exercise, active learning strategies (see our active learning guide), and if appropriate, clinical evaluation for attention difficulties.
Marijuana: As with alcohol, marijuana use is a personal decision. The evidence shows that regular use impairs memory, attention, and motivation, all of which directly affect your ability to perform well in pre-med courses and on the MCAT®. Occasional use carries fewer cognitive risks but is not risk-free. If you choose to use, be aware of the trade-offs and of your institution’s drug policies, which may affect your enrollment, financial aid, or ability to participate in clinical settings that require drug testing.
Nutrition and Physical Health
The “freshman 15” is a cultural myth (average weight gain during the first year of college is 3 to 5 pounds, not 15), but the underlying reality is that college eating habits often deteriorate: irregular meals, late-night snacking, reliance on cafeteria food and delivery, and excessive caffeine intake. Your brain accounts for approximately 20 percent of your daily caloric expenditure, and the quality of your fuel affects its performance. Prioritize regular meals with protein, complex carbohydrates, and vegetables. Limit sugar-sweetened beverages and energy drinks (caffeine is useful in moderation but counterproductive in excess). Stay hydrated. If your campus dining options are limited, learn basic cooking skills. The ability to prepare simple, healthy meals is a practical life skill that will serve you through medical school and beyond.
Exercise: Regular physical activity is the single most effective non-pharmaceutical intervention for stress, anxiety, and mild to moderate depression. It also improves sleep quality, cognitive function, and cardiovascular health. Pre-med students often sacrifice exercise when academic demands increase, but this is counterproductive: the cognitive benefits of exercise (improved attention, memory, and mood) more than compensate for the time spent. Aim for at least 150 minutes of moderate-intensity activity per week (the WHO adult recommendation). This can be as simple as 30 minutes of walking five days a week.
Mental Health in the Pre-Med Environment
Pre-med culture can be toxic. The competitive pressure to maintain a high GPA, accumulate impressive extracurriculars, score well on the MCAT®, and present a “perfect” application creates an environment where students hesitate to show vulnerability, compare themselves constantly to their peers, and sacrifice their wellbeing for productivity. This environment contributes to rates of anxiety, depression, and burnout that are higher among pre-med students than among their non-pre-med peers. Protecting your mental health is not optional. It is a prerequisite for the career you are pursuing. Physicians who did not develop healthy coping strategies during their training are at higher risk of burnout, substance use, and mental health crises during their careers. See our mental health and wellness page and physician burnout page.
If you are struggling, use your campus counseling services (most universities offer free or low-cost sessions), talk to a trusted mentor or friend, and consider whether the pre-med culture around you is supporting your growth or undermining your wellbeing. You deserve both academic success and a life worth living.
For more on navigating undergraduate life, see the undergraduate hub.
Healthy Relationships and Boundaries: College is when many students form their most significant friendships and romantic relationships, and the quality of those relationships profoundly affects your wellbeing. Healthy relationships are characterized by mutual respect, honest communication, support for each other’s goals, and the ability to maintain your individual identity and friendships outside the relationship. Unhealthy dynamics (manipulation, jealousy, isolation from friends, pressure to skip classes or abandon your goals, and any form of physical, emotional, or sexual coercion) should be recognized and addressed. Your campus counseling center, Title IX office, and student health services can provide confidential support if you are experiencing relationship difficulties. Setting boundaries, both in relationships and in your academic and social life, is a skill that healthcare professionals use every day. Learning it now prepares you for the professional boundaries you will need throughout your career.
Building Sustainable Habits for Medical School: The students who thrive in medical school are not the ones who sacrificed their health to get there. They are the ones who arrive with established habits of sleep hygiene, regular exercise, healthy nutrition, effective stress management, and the self-awareness to seek help when they need it. Medical school is more demanding than undergraduate education in both volume and intensity, and the students who have already learned to protect their wellbeing while performing at a high academic level have a significant advantage. Start building those habits now. They are as important to your future career as your GPA and MCAT® score. See our physician burnout page for why these habits matter throughout a healthcare career.
Caffeine and Energy Drinks: Caffeine is the most widely used psychoactive substance in the world, and college students consume it heavily. Moderate caffeine intake (200 to 400 mg per day, equivalent to 2 to 4 cups of coffee) is generally safe for healthy adults and can improve alertness and concentration. However, excessive caffeine intake (more than 400 mg per day), particularly from concentrated energy drinks, can cause anxiety, insomnia, heart palpitations, gastrointestinal distress, and dependence. Energy drinks often contain sugar and other stimulants in addition to caffeine, compounding the risks. If you rely on caffeine to function, consider whether the underlying issue is inadequate sleep rather than insufficient stimulation. Addressing the sleep deficit is more effective and healthier than compensating with caffeine.
References
National Institute on Alcohol Abuse and Alcoholism (NIAAA). “College Drinking.” NIAAA, 2025. https://www.niaaa.nih.gov/publications/brochures-and-fact-sheets/college-drinking. Accessed March 2026.
American College Health Association. “National College Health Assessment.” ACHA, 2025. https://www.acha.org/. Accessed March 2026.