Chicago Marathon Race Week 2026: How to Prep Your Body for Race Day
Race week is here. October 11th is days away, and what you do between now and the starting gun matters more than most runners realize.
This is the clinical breakdown — what to eat, how to hydrate, what to skip, and how to make sure you cross that finish line feeling as strong as possible.
The Biggest Race Week Mistake: Over-Drinking Plain Water
Most runners know to hydrate during race week. What fewer know is that drinking large amounts of plain water without electrolytes can dilute your sodium levels — a condition called hyponatremia — which causes fatigue, headache, and in serious cases, confusion.
The fix: pair water intake with electrolyte-rich foods and drinks throughout race week. Think: sports drinks, broth, salted snacks, and electrolyte tablets. Your urine should be pale yellow — not clear.
What to Eat the Week Before the Chicago Marathon
This isn't the week to try anything new. Stick to foods your gut knows and trust the process:
Monday–Wednesday: Normal balanced eating. Don't overload carbs yet.
Thursday–Friday: Begin gradual carb increase — pasta, rice, bread, potatoes. Keep fat and fiber moderate to avoid GI issues on race day.
Saturday (day before): Simple, familiar carb-heavy meal. Avoid anything spicy, high-fiber, or new. Dinner by 6–7pm.
Race morning: Light, familiar breakfast 2–3 hours before start. Toast, banana, peanut butter. Nothing your body hasn't seen before.
Sleep, Stress, and the Taper Week Mind Game
Taper week is mentally harder than most of training. Your mileage drops, your legs feel weird, and your brain starts questioning everything. This is normal. Your body is storing energy.
Focus on:
7–9 hours of sleep every night this week — recovery and adaptation happen while you sleep
Keeping your easy shakeout runs truly easy — don't try to squeeze in extra miles
Staying off your feet as much as possible the day before the race
Avoiding alcohol the final 72 hours — it disrupts sleep quality and increases dehydration
Should You Book a Pre-Race IV Before the Chicago Marathon?
Some runners book a pre-race IV the day before the marathon to top up their hydration heading into race day. It's not a magic fix — but as a starting point, arriving at the starting line fully hydrated gives your body one less thing to fight through.
At ivMD Chicago, our formula delivers a full liter of medical-grade saline directly into your bloodstream, along with optional anti-inflammatory support. A licensed nurse comes to your hotel or apartment — no clinic, no commute, no waiting room.
Whether you're coming in from out of town or live in Chicago, we make it easy to arrive at race day prepared.
And After the Race — We've Got That Too
Whether you PR or bonk at mile 20, your body is going to need real recovery support after 26.2 miles. We have post-race appointments available throughout Chicago on race day and the day after.
Our post-marathon IV includes the same medical-grade saline plus Toradol for inflammation and Zofran for nausea — the three things that actually move the needle when you're completely depleted.
Good luck on race day, Chicago. You've put in the work.
