Acne and Blood Sugar: How Insulin and IGF-1 Affect Your Skin

Many people look for a single trigger when they struggle with acne. Certain foods often come into focus: sugar, chocolate, or dairy products. It quickly leads to the idea that one particular food makes the skin “bad.”

In reality, it is worth looking at a deeper connection: blood sugar metabolism.

Your blood sugar responds directly to what you eat. After a meal, the level of glucose in your blood rises. The body reacts with hormonal signals that move sugar from the bloodstream into the cells. However, these processes do not only affect energy metabolism. They also influence other systems in the body—including your skin.

For this reason, scientific studies have increasingly examined the role that blood sugar, insulin, and certain growth factors may play in acne.

What Happens in the Body When Blood Sugar Rises

When you eat carbohydrate-rich foods, sugar molecules enter your bloodstream. The body then tries to balance this rise. To do this, the pancreas releases the hormone insulin.

Insulin allows cells to absorb sugar from the blood and use it as energy. This mechanism is essential for life and part of a normal metabolic process.

However, insulin does not only act on blood sugar. The hormone also affects other signaling pathways in the body. One of these involves the so-called insulin-like growth factor 1, or IGF-1.

IGF-1 is a growth factor that controls various cellular processes. It influences cell division, metabolic processes, and hormonal signaling pathways. This factor also plays a role in the skin.

When insulin levels rise frequently, the activity of IGF-1 often increases as well. This is where the connection to acne begins.

Why Insulin Also Affects Your Hormonal Balance

Insulin does not only affect sugar metabolism. The hormone also interacts with other hormonal systems in the body.

Persistently elevated insulin levels can increase the activity of androgens. Androgens are a group of hormones often referred to as “male hormones,” although they also play an important role in the female body.

These hormones act directly on the sebaceous glands in your skin. When androgen activity increases, sebum production can increase as well.

At the same time, insulin influences certain enzymes and signaling pathways that control hormone metabolism. As a result, the hormonal balance in the body may shift.

If insulin levels and IGF-1 activity remain elevated over longer periods of time, these hormonal changes can promote processes that play a role in acne.

Why Insulin and IGF-1 Influence the Skin

Your skin contains numerous sebaceous glands. They produce sebum, an oily substance that keeps the skin soft and protects it from drying out.

Under certain conditions, however, sebum production can increase. This can happen when hormonal signals stimulate the sebaceous glands more strongly.

Insulin, IGF-1, and androgens are among these signals.

When these hormones rise frequently, they can stimulate several processes in the skin. These include increased sebum production and faster cell division in the hair follicles. At the same time, inflammatory signaling pathways in the tissue may change.

This combination can make it easier for pores to become clogged and for inflammatory skin reactions to develop.

One important point is that these processes rarely arise from a single meal. What matters more is how stable your blood sugar remains over time.

Why Strong Blood Sugar Fluctuations Can Be Problematic

The body can usually manage short-term increases in blood sugar. Problems are more likely to occur when blood sugar fluctuates strongly throughout daily life.

Such fluctuations often arise from highly processed foods, rapidly absorbed carbohydrates, or very sugary meals. Blood sugar rises quickly and then drops again shortly afterward.

The body responds to these changes with repeated spikes in insulin.

These hormonal signals do not only affect energy metabolism. They also influence inflammatory processes, hormonal signaling pathways, and the activity of sebaceous glands.

Over time, these processes can change the environment of the skin.

This does not mean that carbohydrates are inherently problematic. Human metabolism is designed to use carbohydrates. What matters more is the overall structure of the diet and the stability of blood sugar metabolism.

Why Extreme Diets Are Rarely the Solution

When people learn that blood sugar may play a role in acne, some draw a radical conclusion: they drastically reduce carbohydrates or remove them almost completely from their diet.

Dietary approaches such as keto or very strict low-carb concepts often promise stable blood sugar levels and, as a result, clearer skin.

In the short term, such approaches can indeed change certain metabolic processes. Over the long term, however, other questions arise.

A very low-carbohydrate diet often also reduces the intake of dietary fiber. Fiber consists of indigestible plant components that play an important role for your gut microbiome.

Many gut bacteria use fiber as an energy source. If fiber is lacking over longer periods of time, the microbial balance in the gut can change.

In addition, very low-carbohydrate diets often contain higher amounts of animal fats and protein. A diet that remains very high in fat and protein for long periods may influence other metabolic processes, for example through inflammatory signaling pathways or metabolic changes.

For this reason, it is worth looking at nutrition in a more differentiated way rather than viewing extreme dietary concepts as a long-term solution.

What Role Dairy Products May Play

Dairy products are also frequently discussed in connection with acne.

One possible reason again lies in the hormonal signaling pathway involving insulin and IGF-1.

Milk contains various bioactive components, including certain amino acids and hormone-like substances. Studies show that dairy products may increase IGF-1 activity in some individuals.

Because IGF-1 in turn influences sebum production and cellular processes in the skin, researchers have discussed a possible connection between milk consumption and acne for several years.

However, this does not mean that dairy products automatically cause skin problems in everyone. The effect can vary significantly between individuals.

For this reason, it can be helpful to observe your own body and look at possible connections carefully.

Why Nutrition Is More Than Individual Nutrients

The connection between blood sugar and acne shows one thing clearly: skin processes rarely arise from a single factor. Hormones, inflammatory processes, metabolic pathways, and dietary habits interact with one another.

If you want to understand your skin in the long term, it helps to avoid focusing only on individual foods. What often matters more is the overall dietary pattern. Some ways of eating promote stable blood sugar levels, support metabolic processes, and provide large amounts of antioxidant plant compounds.

This article offers only a first introduction to the role of blood sugar, insulin, and IGF-1 in your skin. In the ebook, these connections are explored in much greater depth. There you will learn, among other things, how different dietary patterns influence metabolism, why a plant-rich diet can be helpful for many people, and how factors such as acid–base balance, hormones, and individual reactions to certain foods may also play a role in acne. Understanding these connections often opens a new perspective on your skin.