Saturday, April 11, 2026

What is Urban Heat Stress? A Functional Medicine Toronto Info Sheet


Did you know that soaring temperatures can trigger or exacerbate health issues? In this new post, the Toronto Functional Medicine Centre sheds light on: 

  • What urban heat stress is;
  • How it can instigate health challenges;
  • And the ways extreme city heat is related to global warming. 

Understanding Urban Heat Stress

Urban heat stress refers to the physical strains experienced by people in cities from elevated temperatures, especially during heatwaves. It’s exacerbated by the Urban Heat Island (UHI) effect, a phenomenon in which cities are significantly warmer than surrounding rural areas.

Urban heat is enhanced by: 

  • Climate change: Extreme heat shifts in temperatures and weather trends driven by the increased use of fossil fuels, gasses, etc. 
  • Urbanization: When additional people move to cities, it causes declines in natural surroundings (i.e. vegetation, soil). New buildings and roads tend to absorb and release heat, too, which contributes to the UHI effect. 

The constituents listed below can also contribute to the severity of urban heat stress: 

  • Heat-absorbing materials: Concrete, asphalt, and buildings trap and radiate heat.
  • Lack of vegetation: Few trees mean less shade and less evaporative cooling.
  • Waste of heat: Air conditioners, vehicles, and factories release additional heat.
  • Dense infrastructure: Tall buildings reduce air circulation and trap heat at street level.

Heat has noticeably amplified in our country, even affecting the lifespan of Canadians. However, understanding the effects of urban heat stress can help us make informed decisions for ourselves and our loved ones. 

Health Consequences

Extreme city heat comes with an array of challenges, affecting the physical and mental performances of adults and children. In fact, “A U.S. study of mental health-related emergency department visits found an 8% increase in mental health visits on the hottest days of summer compared with the coolest days,” confirms the American Psychological Association. Urban heat stress can also cause or worsen:

  • Heat exhaustion and heat stroke
  • Dehydration
  • Respiratory distress (especially in those with asthma or COPD)
  • Heart attacks 
  • Poor sleep, fatigue, and mental stress
  • Increased mortality, especially in vulnerable groups (elderly, infants, outdoor workers)

If you’re diagnosed with a chronic condition (i.e. diabetes or heart disease), it’s to your advantage to speak to a functional health provider on keeping cool with your condition. Lifestyle modifications may be advised, too, such as optimizing hydration with IV therapy, installing additional fans in your home, and using an umbrella on sunny days.  

Environmental Impacts

It should also be noted that global warming exacerbates urban heat stress, and poorly designed cities intensify the impact of climate change. Urban heat stress is directly linked to global warming — and the two problems amplify each other: 

  • Global warming increases baseline temperatures: Climate change due to greenhouse gas emissions boosts average global and regional temperatures. In turn, heatwaves become frequent, intense, and longer-lasting in busy cities. 
  • Urban areas trap more heat: These environments tend to absorb/retain heat due to the asphalt and concrete streets. This contributes to the UHI effect, and can cause cities to be hotter than rural areas by 5-10°C.

When high global temperatures are paired with urban infrastructures, the risks of forming heat-related illness, energy overuse, and air pollution sharply increase. This combined effect “feeds” into the severity of urban heat stress – but there are ways to help reduce excessive city heat:

  • Speak to local leaders about adding green roofs, planting more trees, or adjusting city layouts for improving ventilation and shade.
  • If you’re planning for outdoor renovations, look into reflective building materials.
  • Visit your local cooling centres.
  • Listen to warning systems or the news to prepare for high heat (i.e. make sure you have enough drinking water at home, shade, etc.)

Taking Action with Functional and Integrative Medicine

Urban heat stress and other environmental factors (i.e. mold) can take a toll on your health status. At the Toronto Functional Medicine Centre, we modify treatment options for your symptom relief and to help prevent the formation of chronic conditions. In fact, a comprehensive approach to wellness is valuable for managing long-term health needs, as well as food sensitivities, chronic pain, menopausal symptoms, and tissue repair. 

Our clinicians adhere to the functional medicine model. This paradigm focuses on individuality, helping to address the root cause of health concerns with tailored strategies, while supporting your natural healing process. These treatments are personalized based on unique constituents, such as medical history, genetics, nutrient deficiencies, lifestyle factors, environmental exposures, results from functional lab tests, and more. 

Each treatment modality from our clinic – including doses of IV therapy and herbal medicine – is customized with the principles of functional medicine. As our naturopathic doctor is trained in pharmacognosy (the study of medicinal derivatives), we can safely combine remedies while helping to avoid medication interactions. We are able to integrate conventional medicine practices with natural therapies (i.e. naturopathic medicine and homeopathic medicine), IV therapy, psychotherapy (lifestyle counselling), Traditional Chinese Medicine, Amazonian herbal remedies, hormone optimization programs (i.e. bioidentical hormone therapy), and more. Especially when it comes to getting intravenous therapy, our treatments are not meant to replace daily healthy habits. When combined with additional functional medicine therapies, as well as balanced eating and exercise, they can support health promotion. 

Just so you know, we’re a patient-centred practice. We encourage you to collaborate with our health providers while your treatment plan is being drafted. We embrace this unique partnership because it provides patients with additional knowledge and confidence in reaching optimal health results. Please don’t hesitate to ask our wellness team any questions!

Are you concerned about exposures to environmental toxins? Take preventative health measures with bespoke functional medicine therapies in Toronto. Simply click here to send us a request your first appointment with us.

Disclaimer: The information in this article is designed for educational purposes only and is not intended to be a substitute for informed medical advice or care. This information should not be used to diagnose or treat any health problems or illnesses without consulting a doctor. You should always consult with a health care practitioner before relying on any information in this article or on this website. Never delay or disregard seeking professional medical advice from your doctor or other qualified healthcare provider because of information you have read from the Toronto Functional Medicine Centre website or other affiliate media. 

References

Arifwidodo SD, Chandrasiri O. Urban heat stress and human health in Bangkok, Thailand. Environ Res. 2020 Jun;185:109398. doi: 10.1016/j.envres.2020.109398. Epub 2020 Mar 19. PMID: 32203732.

Berry, P., Clarke, K., Fleury, M.D. and Parker, S. (2014): Human Health; in Canada in a Changing Climate: Sector Perspectives on Impacts and Adaptation, (ed.) F.J. Warren and D.S. Lemmen; Government of Canada, Ottawa, ON, p. 191-232.

Chen, Kaiyu, et al. “A Multiscale Analysis of Heatwaves and Urban Heat Islands in the Western U.S. during the Summer of 2021.” Scientific Reports, vol. 13, no. 1, 2023, pp. 1-12, https://doi.org/10.1038/s41598-023-35621-7. Accessed 4 Jun. 2025.

Ebi KL, Capon A, Berry P, Broderick C, de Dear R, Havenith G, Honda Y, Kovats RS, Ma W, Malik A, Morris NB, Nybo L, Seneviratne SI, Vanos J, Jay O. Hot weather and heat extremes: health risks. Lancet. 2021 Aug 21;398(10301):698-708. doi: 10.1016/S0140-6736(21)01208-3. PMID: 34419205.

Gronlund, Carina J. “Racial and Socioeconomic Disparities in Heat-related Health Effects and Their Mechanisms: A Review.” Current Epidemiology Reports, vol. 1, no. 3, 2014, p. 165, https://doi.org/10.1007/s40471-014-0014-4. Accessed 4 Jun. 2025.

Heat and health” from the World Health Organizatin (WHO), posted May 28, 2024, viewed on June 5, 2025. 

Heat Waves, Heat Islands, and Your Health” from the National Environmental Education Foundation (NEEF), posted on August 1, 2023, viewed on June 4, 2025. 

How Cities Around the World Are Tackling the Urban Heat Crisis” from Earth.Org, posted June 4, 2024, viewed on June 4, 2025. 

How heat affects the mind” from the American Psychological Association, posted on June 1, 2024, viewed on June 5, 2025. 

Hsu, Angel, et al. “Disproportionate Exposure to Urban Heat Island Intensity across Major US Cities.” Nature Communications, vol. 12, no. 1, 2021, pp. 1-11, https://doi.org/10.1038/s41467-021-22799-5. Accessed 4 Jun. 2025.

Huang, Huanchun, et al. “Urban Heatwave, Green Spaces, and Mental Health: A Review Based on Environmental Health Risk Assessment Framework.” Science of The Total Environment, vol. 948, 2024, p. 174816, https://doi.org/10.1016/j.scitotenv.2024.174816. Accessed 4 Jun. 2025.

Marginean, I., et al. “High-Resolution Modeling and Projecting Local Dynamics of Differential Vulnerability to Urban Heat Stress.” Earth’s Future, vol. 12, no. 10, 2024, p. e2024EF004431, https://doi.org/10.1029/2024EF004431. Accessed 4 Jun. 2025.

Reducing Urban Heat Islands to Protect Health in Canada” published by Health Canada, March 2020, viewed on June 4, 2025. 

Tong S, Prior J, McGregor G, Shi X, Kinney P. Urban heat: an increasing threat to global health BMJ 2021; 375 :n2467 doi:10.1136/bmj.n2467

“What is the urban heat island effect?” from American Forests, posted on September 25, 2020, viewed on June 5, 2025. 

Original article "Toronto Functional Medicine Centre – (416) 968-6961" first appeared in the Toronto Functional Medicine Centre website.

Monday, April 6, 2026

Is Your Vision Waning with Age? Consider Exploring NAD IV therapy in Toronto


With age, vision problems may arise. For these scenarios, a functional medicine practitioner would target the root cause of eye health concerns – and this may involve prescribing NAD IV therapy from our Toronto practice.  

Age-related macular degeneration (AMD), glaucoma, and typical eye fatigue are linked to inflammation and declines in mitochondrial functioning and cellular repair. In fact, “Glaucoma and age-related macular degeneration are leading causes of irreversible blindness worldwide with significant health and societal burdens,” confirms a Nutrients report.  

But scientists have proposed that supplementing with NAD⁺ can be helpful for sustaining eye health and vision protection. This article from the Toronto Functional Medicine Centre unwraps:

  • The vital role nicotinamide adenine dinucleotide (NAD) plays in your vision; 
  • The various ways to increase this coenzyme intake; 
  • And how to access Toronto NAD IV therapy treatments from our IV Lounge.  

Quick Recap: What is NAD+?

NAD+ is a coenzyme found in every cell and it helps convert food into energy. It also has key roles in regulating cellular processes, which means it can impact your body’s metabolic processes and DNA repair. NAD levels decline with age; for som people, these dwindling amounts can cause weight gain, premature aging, chronic inflammation.

Why NAD+ Matters for Your Eyes

Your eyes are one of the most metabolically active tissues in the body. Retinal cells, photoreceptors, and optic nerve fibres actually need an endless supply of energy and are highly sensitive to oxidative damage. However, scientists postulate that NAD+ may be valuable for eye health in these ways: 

  • May promote DNA repair: The tissues in your eyes are constantly exposed to UV lights and environmental toxins, which can hinder retinal cells and impair vision. NAD+ is needed for constructing enzymes for eye DNA repair, so upping your intake may help with repairing cellular damage and supporting long-term vision. 
  • Potentially protects against oxidative stress: Oxidative stress – which is the imbalance between free radicals and antioxidants – can drive the formation of age-related eye conditions, including glaucoma. NAD+ happens to participate in activating sirtuins, which are the enzymes involved in cell repair. Upping NAD+ can support sirtuins to help protect your retinal cells from oxidative stress. 
  • May strengthen mitochondrial functioning and retinal energy production: The cells in your eyes heavily depend on your cells’ mitochondria for generating an energy source called ATP (adenosine triphosphate). Declining NAD levels can impair mitochondrial functioning, contributing to retinal issues; there’s a possibility that upping your NAD intake may be beneficial for cellular survival in the retinal tissue. 

What’s Next? How to Boost NAD Levels 

Interested in NAD+ for eye support? Here are some ways to increase your amounts: 

  • Eat a nutrient-dense diet: Vitamin B3 (niacin) is a NAD precursor, meaning the body uses niacin to produce NAD+. Foods rich in niacin, like fish, poultry, mushrooms, and green vegetables, may be beneficial. 
  • Schedule in regular workouts: “In older adults, exercise training appears to be associated with higher muscle NAD+ content,” confirms an Experimental Gerontology article. “While regular physical activity of about 10,000 daily steps was not effective, structured training with at least 12,500 daily steps successfully prevented the aging-associated decline in muscle NAD+.”
  • Consider NAD oral supplements: Tablets and capsules are available that contain the precursors nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN). In lab studies, NR and NMN have been shown to be safe and tolerable, and can elevate NAD serum levels after ingestion. 
  • Get a NAD IV therapy prescription: Some people may experience inconsistent absorption rates with oral supplements, as the original dose you swallow can diminish from digestive enzymes. To guarantee that you fully absorb NAD, intravenous drips can be prescribed, and our clinic personalizes theses doses to match your biology. NAD IV drips involve administering the coenzyme directly into the bloodstream, bypassing digestion to allow for higher bioavailability. 

It’s important to recognize that NAD+ supplementation, especially IV therapy, is not a one-size-fits-all approach, and it may not be suitable for all patients. A qualified functional medicine provider can assess if NAD+ therapies are appropriate for your body while exploring for underlying issues. At the Toronto Functional Medicine Centre, our clinicians are adept at tailoring NAD-based treatments for personalized protocols. So, if you want to take novel, adjunctive approaches to combat brain fog, free radical damage, and muscle weakness, stop by our location to meet our health team!

Wellness Begins at the Molecular Level – Check Out our IV Lounge Today

The aging process is unique for each individual – that said, personalized therapies can help with promoting healthy longevity. The functional medicine approach scrutinizes your cell health, microbiome, energy production, and more, which helps functional practitioners understand how to optimize your needs. This may be suitable for managing cognitive function, muscle and bone health, weight gain, neurodegenerative disorders, and other chronic concerns.  

Along with blending NAD+ IV drips, we can customize intravenous drips in our IV Lounge with fresh vitamins, minerals, amino acids, and antioxidants. Intramuscular vitamin injections can be prescribed with tailored doses of vitamin D, glutathione, and vitamin B12. And rest assured, our health team of naturopathic doctors, nurse practitioners and registered nurses are always on-site to supervise IV sessions! Please keep in mind, though, that IV and intramuscular treatments are not substitutes for healthy living; when nutrient injections and IV drips are combined with nourishing habits and added functional medicine interventions, then they may support optimal function.  

The Toronto Functional Medicine Centre shares their space with Supernatural Yorkville. Patients can combine services from both practices to further target general wellness issues. Depending on your health circumstances and lab findings, your treatment plan may integrate conventional medicine with naturopathic and Chinese medicine, intravenous therapy, herbal remedies, lymph drainage, cryotherapy, NAD+ IV treatments, and more. 

Discover your path towards rejuvenating cells, improving brain function, and naturally energizing your body! Discover NAD IV therapy from the Toronto Functional Medicine Centre today – book your initial consult with us by clicking here

Disclaimer: The information in this article is designed for educational purposes only and is not intended to be a substitute for informed medical advice or care. This information should not be used to diagnose or treat any health problems or illnesses without consulting a doctor. You should always consult with a health care practitioner before relying on any information in this article or on this website. Never delay or disregard seeking professional medical advice from your doctor or other qualified healthcare provider because of information you have read from the Toronto Functional Medicine Centre website or other affiliate media.

References

Chubanava, Sabina, and Jonas T. Treebak. “Regular Exercise Effectively Protects against the Aging-associated Decline in Skeletal Muscle NAD Content.” Experimental Gerontology, vol. 173, 2023, p. 112109, https://doi.org/10.1016/j.exger.2023.112109. Accessed 17 Dec. 2025.

Cimaglia, Gloria, et al. “Potential Therapeutic Benefit of NAD+ Supplementation for Glaucoma and Age-Related Macular Degeneration.” Nutrients, vol. 12, no. 9, 2020, p. 2871, https://doi.org/10.3390/nu12092871. Accessed 16 Dec. 2025.

Ito, Takashi K., et al. “A Single Oral Supplementation of Nicotinamide within the Daily Tolerable Upper Level Increases Blood NAD+ Levels in Healthy Subjects.” Translational Medicine of Aging, vol. 5, 2021, pp. 43-51, https://doi.org/10.1016/j.tma.2021.09.001. Accessed 17 Dec. 2025.

Lin JB, Apte RS. NAD+ and sirtuins in retinal degenerative diseases: A look at future therapies. Prog Retin Eye Res. 2018 Nov;67:118-129. doi: 10.1016/j.preteyeres.2018.06.002. Epub 2018 Jun 12. PMID: 29906612; PMCID: PMC6235699.

Mahabadi N, Al Khalili Y. Neuroanatomy, Retina. [Updated 2023 Aug 8]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK545310/

Okabe, Keisuke, et al. “Oral Administration of Nicotinamide Mononucleotide Is Safe and Efficiently Increases Blood Nicotinamide Adenine Dinucleotide Levels in Healthy Subjects.” Frontiers in Nutrition, vol. 9, 2022, p. 868640, https://doi.org/10.3389/fnut.2022.868640. Accessed 17 Dec. 2025.

Petriti, Bledi, et al. “Neuroprotection in Glaucoma: NAD+/NADH Redox State As a Potential Biomarker and Therapeutic Target.” Cells, vol. 10, no. 6, 2021, p. 1402, https://doi.org/10.3390/cells10061402. Accessed 16 Dec. 2025.

Poljsak, Borut, et al. “Healthy Lifestyle Recommendations: Do the Beneficial Effects Originate from NAD+ Amount at the Cellular Level?” Oxidative Medicine and Cellular Longevity, vol. 2020, 2020, p. 8819627, https://doi.org/10.1155/2020/8819627. Accessed 17 Dec. 2025.

SaccĂ  SC, Cutolo CA, Ferrari D, Corazza P, Traverso CE. The Eye, Oxidative Damage and Polyunsaturated Fatty Acids. Nutrients. 2018 May 24;10(6):668. doi: 10.3390/nu10060668. PMID: 29795004; PMCID: PMC6024720.

Tribble, James R., et al. “Nicotinamide Provides Neuroprotection in Glaucoma by Protecting against Mitochondrial and Metabolic Dysfunction.” Redox Biology, vol. 43, 2021, p. 101988, https://doi.org/10.1016/j.redox.2021.101988. Accessed 16 Dec. 2025.

Williams, Pete A., et al. “Glaucoma As a Metabolic Optic Neuropathy: Making the Case for Nicotinamide Treatment in Glaucoma.” Journal of Glaucoma, vol. 26, no. 12, 2017, p. 1161, https://doi.org/10.1097/IJG.0000000000000767. Accessed 16 Dec. 2025.

Original article "Toronto Functional Medicine Centre – (416) 968-6961" first appeared in the Toronto Functional Medicine Centre website.