Summer, Sun, Cell Protection – How to Keep Your Body in Balance

Summer brings sunshine, a zest for life—and new demands on our bodies. As temperatures rise, not only does our daily routine change, but so do our nutritional needs. Vitamin D, electrolytes, antioxidants—it all sounds healthy, but keeping track of all these things can be a challenge in the summer. In this article, you’ll learn how to boost your well-being this summer with a few simple tips and keep your body in balance.

Vitamin D – The Sun Vitamin

Vitamin D is often referred to as the "sunshine vitamin" because our bodies can produce it naturally when exposed to sunlight. In reality, however, this production depends on many factors: skin type, time of day, geographic location, and, not least, how much time we actually spend outdoors. People who spend most of their time in the shade during the summer or spend a lot of time indoors, such as at the office, may produce less vitamin D than expected.

Vitamin D is important for many processes in the body:

  • bone metabolism
  • the immune system
  • cell regeneration

However, the right amount is crucial. An optimal blood level is usually between 40 and 60 ng/ml. Significantly higher levels can accumulate in the body and, in extreme cases, lead to symptoms such as muscle weakness, nausea, or heart rhythm disturbances.

Tip: Be sure to have your vitamin D levels checked regularly even in the summer—and take vitamin D supplements specifically when you detect a deficiency, rather than just on a hunch.

Seasonal Eating – Cell Protection on Your Plate

In the summer, our bodies need extra protection from so-called free radicals, which are caused by UV radiation, among other things. A diet tailored to the season provides exactly the nutrients we need to help with this. Colorful vegetables in particular—such as tomatoes, bell peppers, and zucchini—are rich in antioxidants like lycopene, vitamin C, and phytochemicals, which protect our cells from oxidative stress.

Our mitochondria—the “powerhouses” of our cells—also benefit from these nutrients. Foods like spinach, berries, and cucumbers provide important cofactors such as magnesium, B vitamins, and polyphenols. The better nourished our cells are, the clearer, more alert, and more energetic we feel—all without caffeine.

Hydration Hacks – More Than Just Water

In the summer, just drinking water often isn't enough. That's because we lose important electrolytes along with our sweat. Without them, the body can't absorb fluids effectively—and that can really take a toll.

Important electrolytes:

  • Sodium (e.g., from salt)
  • Potassium (e.g., from bananas)
  • Magnesium (e.g., from mineral water or nuts)

Your body's need for fluids increases, especially in hot weather, during exercise, or when you're stressed. If you often feel tired, sluggish, or dizzy, you should therefore pay attention not only to how much you drink but also to your intake of minerals.

Tip: A pinch of salt in the water or a homemade electrolyte drink with lemon can already help.

Ingredients for 1 liter:

  • 1 liter of still or lightly carbonated water
  • Juice from 1–2 organic lemons or limes (freshly squeezed)
  • 1/4 teaspoon of high-quality sea salt or Himalayan salt (contains sodium, magnesium, and potassium)
  • Optional:
    • 1–2 teaspoons of honey, maple syrup, or agave nectar
    • a pinch of baking soda (helps maintain acid-base balance)
    • a few mint leaves or cucumber slices for freshness

Conclusion

Summer health is all about balance: enjoying and making the most of the sun, providing your body with the right nutrients, and staying hydrated wisely. Small changes can make a big difference—giving you more energy, a clear mind, and healthy cells.

 

Sources & further links:

German Nutrition Society (DGE) – Reference Values for Vitamin D

Harvard T.H. Chan School of Public Health – Vitamin D Fact Sheet

German Cancer Research Center (DKFZ) – UV Radiation & Cell Protection

DGE – Hydration & Minerals

WHO – Hydration Guide for Hot Days

Benton, D., Young, H. A., and MacGregor, A., 2015. Executive summary and conclusions from the European Hydration Institute expert conference on human hydration, health, and performance. Nutrition Reviews, 73(suppl_2), pp.55–66: https://academic.oup.com/nutritionreviews/article-abstract/73/suppl_2/55/1931366?redirectedFrom=fulltext&login=false 

Gulcin, I., 2025. Antioxidants: a comprehensive review. Archives of Toxicology: https://link.springer.com/article/10.1007/s00204-025-03997-2

Nature Publishing Group, 2025. Free radicals and their impact on health and antioxidant defenses: a review. Cell Death Discovery: https://www.nature.com/articles/s41420-024-02278-8.pdf 

Wojtunik-Kulesza, K., Oniszczuk, A., Waksmundzka-Hajnos, M., and Oniszczuk, T., 2022. Free Radical Properties, Sources, and Targets; Antioxidant Defense Mechanisms and Their Impact on Health – A Review. Antioxidants, 11(2), p.437: Free Radical Properties, Sources, and Targets; Antioxidant Consumption and Health

 

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FAQs

The term “weight-loss injection” refers to various
prescription medications that are used under certain
medical conditions to treat overweight and obesity
. Well-known active ingredients include semaglutide and tirzepatide.
Among other things, they influence hunger and feelings of fullness and can thereby
reduce energy intake.

GLP-1 stands for glucagon-like peptide-1 and is a naturally occurring hormone in the body
. Among other things, it plays a role in regulating
appetite, satiety, and glucose metabolism. GLP-1-based medications mimic
the effects of this hormone and specifically activate the GLP-1 receptor.

The term “GLP-1 dietary supplement” is not medically defined at
. It generally refers to products marketed as “GLP-1 Support”
or “GLP-1 Booster,” which may contain, for example, dietary fiber,
protein, prebiotics, or plant compounds such as berberine.

What matters most here is the specific ingredient and its scientifically studied effects (
)—not just the name of the product (
).

Dietary supplements and GLP-1 medications
have different mechanisms of action. Medications such as semaglutide or tirzepatide
specifically target certain hormonal signaling pathways. Certain nutrients
and plant compounds, on the other hand, can support other physiological processes,
such as satiety, digestion, or metabolism.

They should therefore not be equated with the pharmacological effects
of GLP-1 medications.

Of particular interest are ingredients associated with satiety,
digestion, or the gut microbiota. These include , for example ,
soluble and fermentable dietary fibers, prebiotics, and
certain plant compounds.

Among other things, dietary fiber can influence digestion
and, through fermentation in the gut, contribute to the formation of short-chain
fatty acids. These, in turn, can influence signaling pathways associated with
the release of gut hormones such as GLP-1.

However, the effect depends heavily on the specific ingredient,
the dosage, and the individual's situation.

Dietary fiber can contribute to a balanced diet
and, among other things, promote satiety and aid digestion.
Soluble and fermentable dietary fibers are particularly noteworthy in this context
.

Good natural sources include vegetables,
legumes, whole grains, fruits, nuts, and seeds. Certain
dietary fibers, such as psyllium or inulin, are also used as dietary supplements.

Protein provides important amino acids for the maintenance and
growth of muscle tissue. An adequate protein intake is therefore particularly important
during significant weight loss.

When combined with regular strength training,
a high-protein diet can help preserve lean body mass as much as possible during
weight loss.

In general, there is no comprehensive list of
foods that are strictly prohibited during GLP-1 therapy.
However, appetite, feelings of fullness, and, in some cases,
tolerance to certain foods may change.

When people eat less overall, the nutritional quality of their diet
 becomes more important. Protein-rich foods, vegetables, fruits,
whole grains, legumes, and other nutrient-dense foods can
serve as an important foundation.

Studies show that weight regain can occur after discontinuing GLP-1-based
medications. In the extension
of the STEP-1 study, participants regained, on average, a significant portion of the weight they had previously
lost within one year of
discontinuing semaglutide.

This underscores the importance of long-term, sustainable
dietary and physical activity habits, even during medication-based
therapy.

GLP-1 therapy does not require a specific diet
. However, since feelings of hunger and fullness change and
people sometimes eat less, it may be helpful to focus
particularly on nutrient density, protein, fiber, and a
varied selection of foods.

Regular exercise, especially strength training, can also be a useful addition to
.

No. GLP-1 dietary supplements and
GLP-1 medications must always be distinguished from one another.

Drugs such as semaglutide and tirzepatide were specifically developed
to activate certain hormonal signaling pathways and have been studied as medications in
clinical trials. Dietary supplements
, on the other hand, contain nutrients or other bioactive substances that can support natural
physiological processes.

The term “GLP-1” on a dietary supplement
therefore does not mean that the product has the same effect as a GLP-1 medication
.