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Fall Equinox: Adjusting Nutrition for Shorter, Cooler Days
The Warm up
Fall Arrives Tuesday, and the Indoor Season Is Already Warming Up
The equinox hits Tuesday, September 22, the moment the sun sits directly over the equator and daylight and darkness land at roughly equal length (NASA). From here the days get shorter every week until late December. For a lot of families that shift shows up first as a logistics problem, practices that end in the dark, dinner pushed later, mornings that suddenly feel harder.
It also happens to be the exact week the indoor calendar comes alive. NHL training camps are on the ice, with preseason games starting September 19 and the regular season opening September 29 (NHL). Youth hockey associations are following the same rhythm, and school basketball is moving into open gyms and early tryouts.
Also on the calendar this week:
NHL preseason opens September 19, with camps already running and rosters getting sorted over the next two weeks.
NFL Week 3 arrives September 24 through 28, with the season’s early storylines starting to hold shape.
MLB’s playoff races are down to the wire, with the Rays, Brewers, Dodgers, and Yankees already in and the AL Central still separated by less than a game (MLB).
College soccer is turning into conference play, where the standings actually start to matter.
Here’s the part almost nobody adjusts for: cooler air and shorter days change what your athlete’s body needs at exactly the moment they stop feeling like anything has changed at all.
The Lead Off
Cold Turns Off Thirst. Winter Turns Down Vitamin D. Neither One Announces Itself.
THE SCIENCE: Start with hydration, because this is the one that surprises parents most. When researchers tested hydration and thirst in cold versus temperate conditions, they found that cold exposure suppressed the sensation of thirst by up to 40%, both at rest and during moderate exercise, and it did so even in athletes who were already measurably dehydrated (Kenefick and colleagues). Read that again. The kids who most needed to drink were the ones least likely to feel like it.
That matters because thirst is already an unreliable guide during exercise. The National Athletic Trainers’ Association notes that thirst normally kicks in once fluid losses approach about 2% of body mass, but during exercise those signals are often absent or ignored entirely, a pattern with its own name in the literature: voluntary dehydration (NATA). Cold weather takes an already weak signal and turns the volume down further. Add the increased urination most of us notice on a chilly morning, and a hockey player in a cold rink can lose meaningful fluid while feeling completely fine.
The second shift is slower and quieter. Vitamin D is produced in the skin from sunlight, and a review of vitamin D in athletes found that low levels were more pronounced in winter than in other seasons, and that indoor athletes carried lower levels than outdoor athletes (Sports Medicine research in PMC). A study of Swiss athletes sharpened the picture: inadequate vitamin D was most common in athletes under 18, in indoor sports, and during the low-sun months of the year (Swiss Sports and Exercise Medicine). Your youth hockey and basketball players sit at the intersection of all three risk factors, and the season that pulls them indoors starts the same week the daylight starts disappearing.
This is not a supplement pitch. It is a timing observation. Vitamin D supports bone and muscle health, exactly what a growing athlete leans on through a long indoor season. The Recommended Dietary Allowance is 600 IU per day for children and teens, and because very few foods contain it naturally, most American intake comes from fatty fish and fortified products like milk, which carries roughly 120 IU per cup (NIH Office of Dietary Supplements).
What This Means for Your Athlete
Stop relying on your athlete to tell you they’re thirsty once the weather turns. Build drinking into the schedule instead of the feeling: a bottle before they leave the house, one on the bench regardless of temperature, one on the ride home. Then look at the week’s meals and ask a simple question. Is there fatty fish, are there eggs, is there fortified milk or yogurt showing up anywhere? If the answer is no and your athlete just moved indoors for the next five months, that’s worth a conversation with your pediatrician rather than a guess in the supplement aisle.
🔄 Translate to Your Sport
Hockey: Cold rink, full gear, high output. Sweat evaporates invisibly under pads, so the usual visual cue of a sweaty shirt disappears. Scheduled sipping between shifts matters more than in almost any other sport.
Basketball: Warm indoor gyms keep thirst signals more intact, but the vitamin D exposure drops to near zero for months. This is the sport where the daylight question matters most.
Soccer and football: Still outdoors, and this is where the cold-thirst gap bites hardest as morning games get colder through October and November.
The Fuel Station
Sheet Pan Salmon With Sweet Potatoes and Broccoli
One pan, about 30 minutes, and it happens to hit both of this week’s themes at once. Salmon is one of the few foods that delivers real vitamin D naturally, and the whole thing comes out of the oven warm on a night when nobody wants a cold meal.
THE PLAYERS (serves 4)
4 salmon fillets, about 5 oz each
2 medium sweet potatoes, cut into 1/2-inch cubes
1 large head broccoli, cut into florets
3 tablespoons olive oil
2 teaspoons garlic powder
1 teaspoon smoked paprika
1 lemon, sliced
Salt and pepper
Optional: 1/4 cup grated parmesan
THE BUILD
Heat the oven to 425°F and line a sheet pan with parchment.
Toss the sweet potato cubes with 1 tablespoon olive oil, the garlic powder, paprika, salt, and pepper. Spread them on the pan and roast 15 minutes on their own. They need the head start.
Pull the pan out. Push the potatoes to one side, add the broccoli tossed in 1 tablespoon oil, and set the salmon fillets in the middle. Brush the salmon with the last tablespoon of oil, season, and lay a lemon slice on each fillet.
Return to the oven for 12 to 14 minutes, until the salmon flakes easily and the broccoli edges are crisp.
Scatter the parmesan over the vegetables if you’re using it and serve straight off the pan.
THE GOAL: Serve as a post-practice dinner, or 2 to 3 hours before an evening game if the schedule allows. The protein and fat digest slowly enough that this is a better recovery meal than a pre-game one, which makes it a natural fit for the nights indoor practice ends at 8pm and everyone is starving.
WHY IT WORKS
Salmon delivers vitamin D and complete protein together, and fatty fish is among the best natural food sources of a nutrient that gets harder to make from sunlight every week from here (NIH Office of Dietary Supplements).
Sweet potatoes restock carbohydrate after a hard indoor session, along with potassium that supports fluid balance (USDA FoodData Central).
Broccoli adds vitamin C and calcium, and calcium is the partner nutrient vitamin D actually helps the body absorb.
Olive oil helps with absorption, because vitamin D is fat-soluble and needs dietary fat present to be taken up efficiently.
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The Lab
Three Drills for the Week the Season Moves Indoors
THE PLAY: Cold tissue behaves differently. Muscle at a lower temperature is stiffer and slower to respond, which is why the same five-minute warm-up that worked in August leaves an athlete underprepared in a 50°F morning or a cold rink. A recent review of warm-up research is honest that the injury-prevention evidence is still debated, but the performance and readiness case is well established: warm-ups raise tissue temperature, improve blood flow, and prime the nervous system for fast, forceful movement (Revisiting the Whys and Hows of the Warm-Up). These three build that readiness in a driveway, a garage, or a hallway.
Drill 1: The Long Ramp (new this week)
Setup. Any open indoor space, roughly 10 steps end to end. No equipment.
The drill. Five minutes of progressive movement before anything explosive. Two minutes of easy marching and arm circles, then one minute of walking lunges, then one minute of skips, then one minute of gradually building strides. The rule is that nothing should feel hard until minute four.
Progression. Once the pattern is familiar, add a final 30 seconds of two or three near-full-speed accelerations, which is the piece most rushed warm-ups skip entirely.
Why it works. It gives tissue temperature time to actually rise before load arrives, rather than asking a cold body to produce a maximal effort in the first 90 seconds. On cold mornings this is the single highest-value five minutes of the day.
Drill 2: The Tight-Space Handle
Setup. A hockey stick and a ball or puck, or a basketball, plus a space about the size of a garage bay.
The drill. Set a small square, roughly three feet per side, with tape or shoes. The athlete keeps the puck or ball moving inside that square for 60 seconds without leaving it, working on touch and control rather than speed. Rest 30 seconds, repeat four times.
Progression. Add a head-up requirement. A parent holds up a number of fingers at random intervals and the athlete calls it out while still controlling the puck or ball.
Why it works. Indoor season means less space and more traffic, in both sports. Handling in a confined area with the eyes up is the exact demand of a crowded slot or a packed lane, and it’s one of the few skills that genuinely improves in a garage in December.
Drill 3: The Single-Leg Hold and Reach
Setup. Bare floor, no equipment.
The drill. Stand on one leg, knee slightly bent. Reach the free foot slowly forward, then to the side, then behind, without letting it touch down and without letting the standing knee cave inward. Six reaches per direction, then switch legs.
Progression. Close the eyes for the forward reach only. It gets substantially harder, because the body loses the visual reference it was quietly relying on.
Why it works. Both hockey and basketball load one leg at a time constantly, on edges and on landings. Controlled single-leg work builds the ankle and hip stability those movements depend on, and it costs nothing but floor space.
Parent Playbook
The Seasonal Dip Is Not a Character Flaw
THE STRATEGY: Something predictable happens over the next eight weeks. Practices end after dark, homework slides later, mornings get harder, and the kid who bounced out the door in August starts dragging. It is genuinely easy to read that as attitude. It is more often arithmetic. Teens need 8 to 10 hours of sleep, most are not getting it, and the biological shift of puberty already pushes their natural sleep timing later, which earlier schedules then collide with (American Psychological Association). Add a practice that now ends in the dark and dinner at 8:30, and the same athlete has less recovery than they had a month ago through no fault of their own.
THE PLAY: Pick the one thing that slips first in your house when evenings get dark, and protect just that one thing. For most families it’s dinner time or lights-out time. Move it back to where it was in September and hold it for two weeks before adding anything else. One anchor, held consistently, does more than a full schedule overhaul that lasts four days.
🔄 Translate to Your Sport
Hockey: Ice times are the hardest schedule in youth sports, and a 9pm slot or a 5am skate makes the sleep math brutal. If you can only protect one thing, protect the night before the early one.
Basketball: Gym time is usually more forgiving. Use that to your advantage and set the anchor now, before the season tightens.
THE CONVERSATION STARTER: “What’s the hardest part of the day now that it’s getting dark so early?”
🏆 Play of the Week
Watch an NHL Preseason Game Like a Coach
THE PLAY: NHL preseason opens September 19, and preseason is genuinely the best hockey of the year to watch with a young athlete. Rosters are unsettled, so you’re watching players who are auditioning, which means effort is visible in a way it sometimes isn’t in February. Pick one game and give your athlete two things to track:
Watch one player for a full shift and count how many times they change direction. Most kids are shocked at the number.
Watch the bench. Who is drinking water, and when? This is the week to make that visible rather than something you nag about.
THE GOAL: The water observation does quiet work here. When an athlete notices that professionals drink on a schedule in a cold rink, hydration stops being a parent rule and starts being something real players do. That’s a more durable lesson than any reminder from the driver’s seat.
THE FINAL WHISTLE
Small Adjustments, Made Early
The equinox is a useful marker precisely because nothing dramatic happens on Tuesday. The light shifts a little, the air cools a little, and the season quietly changes underneath a schedule that looks the same as last week’s.
That’s the whole point of getting ahead of it. Two changes, both small. Build drinking into the routine instead of waiting for thirst that cold weather has already muted. Glance at the week’s meals with vitamin D in mind now that the sunlight is doing less of the work. Both get harder to fix in January than they are this week.
Your athlete is not going to notice any of it, which is sort of the goal. They just get to keep playing a game they love, with a body that has what it needs to keep up.
See you on the sidelines,
The Seasoned Sidekick Team
Pass the Assist
Know a hockey or basketball family heading into their first full indoor season? The cold-weather hydration gap catches almost everyone the first year, and it’s a lot easier to build the habit in September than to fix it in December. Forward this before their next practice.
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Medical Disclaimer: The content in The Seasoned Sidekick is for informational and educational purposes only. It is not intended to replace the advice of a licensed physician, registered dietitian, or certified athletic trainer. Always consult a qualified healthcare provider before making changes to your athlete’s nutrition, training, or recovery plan, including before starting any supplement. Individual needs vary. The information presented is based on available research and general guidelines for youth athletes.