You know this moment. The days are still mild, but the mornings are chilly. We go out in a t-shirt at noon, we shiver in the evening. And without really knowing why, we feel more tired, a bit flat — even though nothing particular has happened.
It's not your imagination. It's your body managing, behind the scenes, one of the most demanding transitions of the year.
What you are going to learn: why the interseason puts so much strain on the body, and five concrete levers, within your reach, to get through this period smoothly.
The body hates thermal roller coasters
In summer, it's hot outside and hot inside: the body has only one instruction. In winter, it's cold outside and hot inside: that's stable too. The problem is the in-between.
In the interseason, the temperature can vary by 15 degrees in a single day. Your body, on the other hand, must constantly readjust to maintain its 37 °C. This invisible work uses energy — and that expenditure is often felt as fatigue.
Research on seasonality confirms it: it's not just the low temperatures that weigh heavily, but the magnitude of the fluctuations. Large variations during a single day put more strain on the body than the stable cold of January.
Less light, less vitamin D
There is a second, more discreet upheaval: the days are getting shorter.
Yet most of our vitamin D is produced by the skin, in contact with the sun’s rays. From autumn onwards, this natural synthesis slows down significantly — and in France as well as Luxembourg, a significant part of the population has an insufficient intake at this time of year.
This is a point that deserves attention, because vitamin D contributes to the normal functioning of the immune system*. Ensuring adequate intake at the start of autumn is therefore a smart way to support this transition.
5 levers that you can really control
1. Dress in layers. Several thin layers that you can take off and put on, rather than a thick jumper. It’s the best response to temperature swings of 15 degrees in a day.
2. Protect your sleep. It’s the most underestimated lever. As the days get shorter, go to bed a little earlier: rest is when the body repairs itself.
3. Seek morning light. 10 to 15 minutes outside in the morning helps reset the internal clock and supports morale when brightness decreases.
4. Mind what’s on your plate. Seasonal fruits and vegetables, fatty fish, eggs: a varied diet remains the foundation of good health in autumn.
5. Think about vitamin D. When the sun becomes scarce, an appropriate intake can help make up for what the skin no longer produces. Talk to your doctor or pharmacist about what is suitable for your situation.
Key takeaways
Autumn is not a threat — it is a transition. And a transition is something you ease into — gently, consistently, listening to the signals your body sends.
The change of season reminds us of an obvious truth: taking care of oneself is not a matter of a day, but of a habit. The sleep of September, the light of October, the plate of November — it is regularity that builds well-being, not the intensity of a moment.
Our range
To accompany this period, ImunoBran® PLUS Vitamin D3 combines the arabinoxylan from rice bran with vitamin D3. Vitamin D contributes to the normal functioning of the immune system.*
* Health claim authorised by the EU (Regulation (EU) No 432/2012).
Dietary supplements do not replace a varied and balanced diet or a healthy lifestyle. Follow the recommended daily dose. Keep out of reach of young children. If you are undergoing medical treatment, pregnant or breastfeeding, seek advice from your doctor or pharmacist.