SumGood Foods Inc. · Scientific reviewer: Dr. Bohdan L. Luhovyy, PhD, Mount Saint Vincent University · Last reviewed: · 12 min read
If you're trying to drink eight glasses of water a day because some health article said so. You can stop. The 8x8 rule has no scientific basis. It traces back to a 1945 Food and Nutrition Board note that already counted the water in your food.
Daily hydration advice is a mess of myths (8x8), under-discussed gaps (most Canadians don't get enough potassium), and ingredient red flags (artificial dyes still legal in Canada that the U.S. just banned). Families need a clear, Canadian-aware guide that respects both science and common sense. This pillar covers what daily hydration actually requires, why electrolyte ratios matter for everyday, not just athletic, needs, what to look for on a label, and how to make smarter choices for the whole family without turning hydration into a chore.
How much water do you actually need per day?
The Institute of Medicine's Adequate Intake is 3.7 L/day for men and 2.7 L/day for women, and that's total water, including everything in your food. EFSA's number is slightly lower (2.5 L men, 2.0 L women) but counts the same way. Neither is the same as "drink 8 glasses of plain water on top of meals" (Mayo Clinic, 2025).
Where did the 8x8 rule come from, then? Best traced to a 1945 Food and Nutrition Board note that recommended about 2.5 L/day total, but the same paragraph noted that "most of this quantity is contained in prepared foods." The "prepared foods" caveat got dropped somewhere along the way, leaving us with the modern myth.
What do real Canadians and Americans actually drink? CDC NHANES data shows U.S. men average 3.46 L/day and women 2.75 L/day total water from foods plus liquids, close to the IOM AI numbers, suggesting most adults are roughly on target without obsessing about it (CDC NCHS). About 20% of total water comes from food: fruits, vegetables, soup, yogurt, even bread.
Individual variation matters more than the headline number. Climate, body size, activity, pregnancy or breastfeeding status, illness, and medications all push the target up or down. So treat the AI as a baseline, not a quota. For a deeper dive into individual variation, see how much water do you actually need per day.
What happens when you're even a little dehydrated?
Mild dehydration, about 1.6% body water loss, measurably impairs vigilance, working memory, and mood, while increasing both anxiety and fatigue (Armstrong et al., British Journal of Nutrition, 2011). A 2025 meta-analysis estimated dehydration affects 16-21% of the general population at any given time, rising to 24% in older adults (Parkinson et al., Clinical Nutrition, 2023).
That cognitive cost shows up before you "feel thirsty." Thirst is a lagging indicator. By the time it kicks in, you've already taken the performance hit. A 2024 study in the American Journal of Human Biology found that allowing middle-aged and older adults to dehydrate ad libitum (drinking only when they wanted to) led to measurably poorer sustained-attention performance compared to hydrated controls (Rosinger, 2024).
Who's most at risk for accidental mild dehydration? People who don't sit near water at work, parents in the chaos of school mornings, anyone on common medications that increase fluid loss (diuretics, certain blood pressure meds), and outdoor workers in summer or heated indoor environments in winter. None of these groups thinks of themselves as "at risk." That's part of the problem.
Why the potassium-to-sodium ratio in your drink matters more than you think
More than 80% of Canadians fall below the potassium Adequate Intake (3,400 mg for men, 2,600 mg for women), and Health Canada now classifies potassium as a "nutrient of public health concern". Yet most mainstream sports drinks deliver a 1:3 potassium-to-sodium ratio, the opposite of what most everyday users need (Health Canada / CCHS, 2021).
Why does potassium matter so much? It supports nerve and muscle function, helps offset the blood-pressure effects of sodium, and plays a role in cell fluid balance. The Canadian potassium gap is well-documented: most adults eat too few fruits, vegetables, beans, and leafy greens to meet the AI, and that gap doesn't close just because they hit their water intake.
So why are most sports drinks sodium-forward? Because they were designed for elite-endurance athletes losing 1-2 g of sodium per hour through sweat, not for the average desk-worker, school-pickup parent, or hot-yoga regular. The category got built for one user and then sold to everyone else.
For the post-exercise athletic context where sodium-forward formulas do make sense, see why electrolyte ratios matter more than the brand on the bottle.
How much sugar are your hydration choices adding?
Added sugars account for roughly 16% of daily calories in U.S. children, about 17 teaspoons per day, against the American Heart Association limit of 6 teaspoons (AHA). Canadian children and adolescents also exceed the WHO 10% free-sugar limit, with preschoolers' added-sugar intake well above guidance (CMAJ Open, 2021).
"No added sugar" is meaningfully different from "low sugar." Whole-fruit sugar comes packaged with fibre, vitamins, water, and a slower glycemic curve. Added sugars (cane sugar, glucose-fructose, high-fructose corn syrup, the rest) come without any of that, and beverage sugars hit the bloodstream faster than food sugars, with stronger effects on insulin and energy crashes.
Practical label-reading rule for parents: look at the "Added Sugars" line on the Nutrition Facts panel. If it's blank or zero, you're working with naturally-occurring fruit/dairy sugar. If it's not, compare the grams to the AHA daily limit of about 24g for school-age kids. One serving of many "kid" drinks gets close to or past that on its own.
Artificial dyes: what Canadian parents should know in 2026
The U.S. FDA banned Red Dye No. 3 (FD&C Red No. 3 / erythrosine) in food on January 16, 2025, with a reformulation deadline of January 15, 2027, but Health Canada still permits it. Canadian parents reading "no artificial dyes" on a label are checking for a regulatory protection their food system doesn't yet provide (FDA, January 2025; CBC News, 2025).
The history matters here. Red No. 3 was banned for use in cosmetics in 1990 after high-dose rat studies linked it to thyroid tumours. The food ban took another 35 years and was driven in part by the 1958 Delaney Clause, which prohibits FDA approval of any additive shown to cause cancer in animals or humans. Health Canada operates under different statutes and has not issued the same prohibition.
What other artificial colours are commonly found in Canadian-market drinks marketed to kids? Allura Red AC (Red 40), Sunset Yellow FCF (Yellow 6), Tartrazine (Yellow 5), Brilliant Blue FCF (Blue 1). Each has its own evidence base and ongoing regulatory debate. The 2007 Southampton study and subsequent EU action led to mandatory warning labels on certain colour-additive combinations in Europe; Canada has not adopted equivalent labeling.
This isn't a fear pitch. It's information you can act on as you choose. Some families care a lot about colour additives; others don't. What matters is that you can read a label and know what you're choosing. SumGood freezies use no synthetic colours. The colour comes from the pressed fruit itself. Whether that matters to your family is your call.
How does your body lose electrolytes in daily life, not just at the gym?
Sweat sodium concentration ranges from 200-2,000 mg/L, while sweat potassium stays relatively stable around 5 mmol/L regardless of intensity. Most everyday non-athletes lose far less sodium than mainstream sports-drink labels assume (J. Applied Physiology, 2023). The size of your loss depends on how hard you sweat, how often, and your individual sweat composition, which is genetically variable.
What counts as everyday electrolyte loss? Sitting in a hot car. Walking the dog in summer. A long day on your feet at work. Cleaning the house in a heated home in February. A toddler who's been running around outdoors for two hours. None of those involve "exercise" in the formal sense, but all of them produce some sweat output, and over a full day, the cumulative loss matters.
The mismatch between everyday hydration needs and elite-athlete formulations is the part that doesn't get talked about. A 65 kg desk-worker drinking a serving designed for a marathoner is loading sodium they didn't lose, sodium that, over time, contributes to higher blood pressure risk if it's a regular habit. The right product for daily use is calibrated to the daily user, not the outlier.
How do you build hydration into a family routine?
Adherence beats optimization. The most clinically effective hydration strategy is the one your family will actually keep up with, which means accessibility, taste, and variety matter as much as composition (NATA, 2017). The "perfect" beverage in the wrong format, at the wrong moment, doesn't get drunk.
What works in real households? Visible water bottles assigned to each family member (not "the family water bottle"). Hydration cued to existing routines: a glass with breakfast, water on the dinner table by default, a freezie as the after-school treat that happens to also contain electrolytes. Variety matters because palate fatigue is real, especially for kids and seniors. The same flavour every day stops getting drunk.
Frozen formats can do double duty in the family hydration toolkit: treat-coded for kids, palatable for seniors, easier on a nauseous stomach, and naturally portion-controlled. The 2024 Mount Saint Vincent University clinical study found SumGood freezies scored 7.0/9 on a hedonic palatability scale, statistically equivalent to pizza, one of Canada's most-liked foods (full sensory data on the Our Research page). That's measurable evidence that the format clears the adherence bar.
For specific lunchbox-friendly hydration ideas beyond juice boxes, see 12 healthy lunchbox drink ideas.
What should you look for on a hydration product label?
A clean everyday hydration label has four checkpoints: (1) sodium under ~200 mg per serving for non-athletic use, (2) potassium at least equal to or greater than sodium, (3) no artificial dyes (regardless of regulatory status), (4) no added sugars beyond what's naturally in fruit. Use these as a brand-neutral checklist, not a brand pitch.
How do you actually read a Canadian Nutrition Facts panel for hydration purposes? Find the "Sodium" line and check the % Daily Value: under 5% per serving is "low." Find the "Potassium" line (now mandatory on Canadian labels post-2017) and prefer products where it's not zero. Read the ingredient list start to finish. Ingredients are listed in descending order by weight, so if "sugar" or any synonym is in the top 3, you're paying for sugar more than for fruit. Look for FD&C colour names; their absence is a positive signal.
The criteria above are public. Any brand can be measured against them. SumGood happens to fit the criteria: no artificial dyes, no added sugar, potassium-forward 5:1 ratio, sodium calibrated for everyday use. We're transparent about that because the framework matters more than any single brand. If a different product fits the same criteria better for your family, that's a win for hydration.
If you'd like to try the format that the MSVU study tested, you can shop SumGood freezies here. If you'd rather keep researching, scroll down to the FAQ.
Frequently asked questions
How much water do you actually need per day?
The Institute of Medicine Adequate Intake is 3.7 L/day for men and 2.7 L/day for women, total water from all sources including food. EFSA recommends 2.5 L for men and 2.0 L for women. The 8 glasses a day rule has no scientific basis (Mayo Clinic, 2025; IOM DRI).
What is a natural electrolyte drink?
A beverage that delivers sodium, potassium, and other minerals from food-based sources like pressed fruit, sea salt, or coconut water rather than synthetic dextrose, maltodextrin, artificial colours, or artificial sweeteners.
Are electrolyte drinks safe for kids?
Within Health Canada electrolyte ranges and free from artificial dyes and added sugars, yes, though water and milk remain the foundation. More than 75% of US children fall below IOM water-intake recommendations (Kenney et al., NHANES). Always discuss new beverages with your pediatrician.
Is the 8x8 rule actually true?
No. The 8 glasses of water a day rule traces back to a 1945 Food and Nutrition Board note that already included food moisture in the total. Total water needs vary by individual; the IOM Adequate Intake (3.7 L men / 2.7 L women, all sources) is the more useful guide (Mayo Clinic, 2025).
What's the difference between sports drinks and natural electrolyte drinks?
Most mainstream sports drinks were formulated for elite athletes: high sodium (300-1000+ mg/serving), ~6% sugar, often artificial colours. Natural electrolyte drinks typically prioritize potassium, use food-based ingredients like pressed fruit, and limit added sugars and synthetic dyes.
The bottom line
Daily hydration doesn't need to be complicated, but it does benefit from one ounce of label-reading and one big myth thrown out. The 8x8 rule wasn't science. Most Canadians don't get enough potassium. Mainstream sports drinks were built for elite athletes. And artificial dyes the FDA just banned are still legal here. Take what works for your family and ignore the marketing.
- Total water needs are ~3.7 L men / 2.7 L women, including food, not 8 glasses on top of meals.
- More than 80% of Canadians fall below the potassium AI; potassium-forward beverages help close that gap.
- Mainstream sports drinks were designed for elite athletes. Most everyday users need less sodium, more potassium.
- Red Dye No. 3 is still permitted in Canada; the FDA banned it in food in January 2025.
- Adherence, taste, format, accessibility, matters as much as composition.
Want the underlying clinical study? download the full Mount Saint Vincent University Final Report. Ready to try a clean-label freezie? Shop SumGood →