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Ritucharya (seasonal routine, S. Hemisphere)

Ritucharya is the Ayurvedic seasonal regimen: the classics divide the year into six seasons and set out a diet and lifestyle for each, holding that people who follow the regimen suited to each season gain strength and complexion. The classical season dates follow the Indian calendar, so in the Southern Hemisphere the seasons fall in opposite months, and Ayurvedic commentators hold that the regimen should follow the season's actual qualities rather than fixed dates. Studies of the testable premise, that the body changes with the seasons, find seasonal patterns in immune gene expression that are inverted between Europe and Oceania, higher blood pressure in colder weather worldwide, and season as a major determinant of vitamin D status in Australian adults. Only the blood pressure claim reaches moderate certainty, and no trial has tested following Ritucharya itself.

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Evidence retrieved up to

What the research shows

Blood pressure varies with the season, running lower in warmer weather and higher in colder weather, across both sexes, all age groups and people with or without high blood pressure.

Moderate certaintyFurther research may change the size of the effect.
No known concerns at usual amountsUnclear

Who this is about

people of all ages worldwide

Practical note

Graded moderate: observational evidence, upgraded for a consistent temperature gradient found across many populations; the source is an expert consensus review rather than a pooled meta-analysis.

Safety note

People taking blood pressure medicine who notice symptoms as the weather changes should talk with their own health professional rather than change medicine themselves.

Sources

In Australian adults, season is one of the main determinants of vitamin D status, after the amount of skin exposed to the sun and location.

Low certaintyFurther research is likely to change this.
No known concerns at usual amountsUnclear

Who this is about

Australian adults aged 18-75

Practical note

In the AusD Study, skin exposed explained 27% of the explained variance in serum 25(OH)D, location 20% and season 17%. Graded low: cross-sectional design.

Vegan note

Plant foods supply little vitamin D, so people on a vegan diet depend more on sun exposure, fortified foods or supplements, which matters most in the cooler months.

Safety note

Sun exposure for vitamin D has to be balanced against skin cancer risk, which is high in Australia.

Sources

In adults, the activity of thousands of genes in white blood cells and fat tissue varies with the season, with a more pro-inflammatory immune profile in winter, and the seasonal pattern is inverted between Europe and Oceania.

Low certaintyFurther research is likely to change this.
No known concerns at usual amountsUnclear

Who this is about

adults in cohorts in Europe, Oceania and The Gambia

Practical note

The study reported more than 4,000 protein-coding genes with seasonal expression profiles. Graded low: a single observational analysis, indirect to any seasonal routine.

Safety note

Descriptive observational finding; it shows that physiology changes with the seasons, not that any seasonal regimen changes it.

Sources

What the tradition holds

A 2011 review in the journal AYU maps the six Ayurvedic seasons to approximate Gregorian months for the Indian subcontinent, with Shishira (winter) about mid-January to mid-March, and its authors suggest that where seasons no longer follow that pattern, the regimen can be decided from the actual balance of Dosha and Panchamahabhuta (elemental) conditions.

No known concerns at usual amountsUnclear

Who this is about

people following Ayurvedic lifestyle practice

The tradition's frame

Ayurveda

Ritucharya rests on Dosha and Panchamahabhuta theory: each season brings qualities such as cold, heat, rain or dryness that shift the doshas, and the seasonal regimen is set to balance those qualities.

Practical note

The review gives month ranges for the Indian subcontinent only and says nothing about other regions. As a separate observation, not from this source: in the Southern Hemisphere the seasons fall in the opposite calendar months, and a seasonal gene-expression study found patterns inverted between Europe and Oceania (see the seasonal immune gene expression claim).

Safety note

Applying the Indian calendar dates literally in the Southern Hemisphere would pair winter practices with summer weather.

Sources

Ayurveda holds that the year has six seasons, each with its own diet and lifestyle regimen, and that people who follow the regimen suited to each season gain strength and complexion.

Take care: see the safety noteBenefit

Who this is about

people following Ayurvedic lifestyle practice

The tradition's frame

Ayurveda

Ayurveda holds that each season (Ritu) shifts the balance of the three doshas (Vata, Pitta, Kapha), digestive fire (Agni) and bodily strength (Bala), so diet and lifestyle should change with the season to keep the doshas in harmony.

Practical note

The six classical seasons are Shishira (winter), Vasanta (spring), Grishma (summer), Varsha (monsoon), Sharata (autumn) and Hemanta (late autumn).

Vegan note

Some classical seasonal diets include milk, ghee, honey or meat; the seasonal logic of tastes and warm or cooling foods can be followed with plant foods.

Safety note

Most seasonal advice concerns ordinary food choices, bathing and exercise, but the classical regimens also include evacuative procedures such as therapeutic emesis (Vamana) and nasal administration (Nasya); those belong only under a qualified practitioner and are not a self-care practice. No trial has tested following the full seasonal regimen.

Sources