Light, Gut, and Brain: A Comprehensive View on Overweight

Overweight is often perceived as a simple result of excessive calorie intake and lack of physical activity. However, current research suggests that it is much more complex and may begin where we least expect it – in our eyes and gut microbiota.

Let's start with the eyes. Research indicates that altered - unnatural light spectrum can affect our retina and thus the brain. This effect manifests in body weight regulation, where disrupted lighting conditions can lead to imbalance.

Next, let's look at the gut microflora. Suboptimal bacteria produce lipopolysaccharides (LPS), which are toxins that can increase leptin levels in the blood. Leptin is a hormone that regulates the feeling of satiety. When its level is elevated for a long time, it can lead to leptin resistance. This condition disrupts the body's proper response to this hormone, which can contribute to the development of obesity.

Leptin resistance further affects the brain. It causes disruption of DHA recycling in the retina and slows down circadian rhythms. These changes influence food-related behavior, including a decrease in dopamine levels in the brain, which affects our cravings and feelings of satiety.

Increased intestinal LPS can lead to the development of cerebral cavernous malformations (CCM), which are clusters of blood vessels in the brain. These malformations can cause serious health problems such as seizures or strokes.

Research has also highlighted the importance of the lighting environment and its impact on bodily processes. It appears that our exposure to light can have a significant effect on our health, including the development of obesity.

In connection with our approach to weight loss and a healthy lifestyle, it is essential to recognize the key importance of light, which plays a significant role not only in relation to overweight but also to overall health. Modern artificial lighting, especially blue light from electronic devices, has the potential to disrupt our circadian rhythms and hormonal balance. Special attention deserves the effect of isolated blue light on the peptide POMC (proopiomelanocortin), ACTH (adrenocorticotropic hormone), and CLIP. This light can "hijack" these hormones, leading to increased levels of insulin and blood glucose, regardless of what you eat, which represents a significant risk factor for overweight and other metabolic problems. Natural sunlight, on the other hand, plays a crucial role in regulating sleep, mood, and metabolic processes, and exposure to natural light can help regulate important hormones such as leptin, which is key for proper weight regulation. This aspect highlights how our environment, including light exposure, can affect our overall health and well-being. Understanding the influence of light on our body offers another important tool in the fight against overweight, pointing to the need to focus not only on diet and exercise but also on the overall lifestyle and environment in which we live. For this reason, choosing the right environment for exercise, especially regarding lighting, is crucial. Exercising under artificial light, particularly under intense blue light from LED and fluorescent sources, can negatively affect melatonin production, which is important for quality sleep and body regeneration, and may contribute to leptin resistance. Conversely, exercising in natural light, for example outdoors, can support healthy rhythms of leptin and POMC production, help improve body weight regulation, and promote optimal metabolism. Choosing the right exercise environment that respects natural lighting conditions is therefore key to supporting optimal health and vitality.

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