Brenda Khan
There is a link between diet and skin health, and certain foods can cause acne breakouts. High-glycemic foods such as sugary drinks, sweets, white bread, and rice can cause acne as they cause a spike in blood sugar levels. Insulin increases the activity of androgen hormones and boosts sebum production, which can lead to acne. Milk, especially skim milk, has been linked to acne, although the reason is not yet known. A low-glycemic diet that includes fruits, vegetables, whole grains, and lean meats may reduce acne. Dry skin can also be a result of a diet lacking in essential vitamins and minerals, such as vitamins A, C, D, and E, zinc, iron, and fatty acids.
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What You'll Learn
The link between diet and skin problems
Diet and skin health are linked in multiple ways. Firstly, a change in diet can cause stress, which can lead to skin problems such as acne. Secondly, specific foods in a new diet can directly cause skin issues. For example, a very low-fat diet can lead to dry, flaky skin as fatty acids are required for skin health.
Some foods are more likely to cause acne than others. A high-glycemic diet, which includes foods that cause a rapid increase in blood sugar, may worsen acne. Such foods include white bread, corn flakes, puffed rice, white potatoes, fries, doughnuts, pastries, and sugary drinks. These foods can cause inflammation throughout the body and excess sebum production, both of which can lead to acne.
In addition, milk and milk products have been linked to acne in several studies. Milk interacts with the body to increase oily substances that clog pores, and dairy products such as milk and whey protein can cause a rise in insulin levels, altering hormones that affect the skin. However, it is important to note that other studies have found no link between diet and acne, and that the connection may be a result of recall bias.
Furthermore, some diets may help improve skin health. The keto diet, for example, can reduce inflammation and eliminate inflammatory foods such as refined grains and sugar. However, it may also cause digestive issues, changes in the microbiome, increased urine production, and altered sebum production, all of which can impact the skin.
While diet may play a role in skin problems, other factors are also at play, including skincare products, medication, genetics, pollution, smoking, and stress. It is important to note that there is no consensus that changing one's diet is an effective way to deal with acne, and a balanced approach that enjoys favourite foods in moderation is recommended.
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The role of insulin and blood sugar
Insulin is a hormone that is released by the pancreas. It helps regulate blood sugar levels by controlling how much glucose your cells can absorb. When blood sugar levels rise, the pancreas produces insulin, which prompts cells to absorb blood sugar for energy or storage. As blood sugar is absorbed, levels in the bloodstream begin to fall, and the pancreas starts making glucagon, a hormone that signals the liver to start releasing stored sugar. This interplay of insulin and glucagon ensures that cells throughout the body, especially in the brain, have a steady supply of blood sugar.
Insulin resistance is a condition in which the body does not respond to insulin as it should. This can lead to elevated blood sugar levels, which can increase the risk of prediabetes and diabetes. Insulin resistance can be caused by various genetic and lifestyle factors, including diet. Eating many high-glycemic-index foods, which cause powerful spikes in blood sugar, can lead to an increased risk of type 2 diabetes, heart disease, and overweight. These foods include white bread, sweetened cereals, pasta, baked goods, and sugary drinks. Dairy products, such as milk, can also spike insulin levels and cause skin irritation.
On the other hand, healthy fats found in nuts, seeds, and their butters can help control blood sugar response. These foods provide essential nutrients like magnesium, fiber, and protein without adding too many carbohydrates. A personalized approach to nutrition is best, as everyone responds differently to foods. While one person might experience a high blood sugar spike after eating a particular food, another person may have a more moderate response.
By choosing the right foods, you can reduce insulin resistance and help keep your blood sugar in check. This may involve reducing carbohydrates and unhealthy fats, such as sugar and red meat, and increasing your intake of whole foods, vegetables, fruits, and whole grains. Physical activity can also help increase glucose energy usage and improve muscle insulin sensitivity.
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Inflammation and acne
Acne is an inflammatory skin condition that affects nearly 10% of the world's population. Inflammatory acne causes red, swollen, and painful blemishes on the skin, often on the face, back, chest, and shoulders. These pimples are deep in the skin and contain bacteria, pus, dead skin cells, and excess oil.
The conventional perspective of acne pathogenesis holds that Propionibacterium acnes colonizes the duct of the sebaceous follicle, causing an innate immune response and the progression from a non-inflammatory comedo to an inflammatory papule, pustule, or nodule. However, this viewpoint has been challenged by evidence suggesting that inflammation may exist throughout the acne lesion's lifecycle, even before comedo formation. This challenges the current classification of non-inflammatory versus inflammatory acne lesions, indicating that inflammation is a fundamental process in the early development of acne.
Several factors can contribute to the development of acne, including sebum and keratin production, acne-causing bacteria, hormones, blocked pores, and inflammation. Food sensitivity reactions can also increase inflammation in the body, potentially worsening acne. Additionally, diets high in sugar, fat, and refined carbohydrates can increase the risk of acne due to their impact on blood sugar and insulin levels. Insulin activates androgen hormones and increases insulin-like growth factor 1 (IGF-1), contributing to acne development by enhancing skin cell growth and sebum production.
To manage inflammatory acne, various treatments are available, including over-the-counter skincare products and prescription medications. Topical treatments, oral antibiotics, and extraction procedures can be recommended by healthcare professionals. It is important to note that inflamed acne should not be popped, as it can increase inflammation and cause it to spread.
While dieting can improve skin health by reducing stress levels, certain diets may trigger breakouts. The "dieter's acne" phenomenon refers to breakouts that occur when starting a new diet or experiencing stress due to dieting. Additionally, low-fat diets can lead to dry, flaky skin due to reduced fatty acid production, impacting the skin's ability to retain moisture.
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Skin dryness and diet
Dieting can cause skin dryness, particularly if you're on a very low-fat diet. Part of the outer layer of skin is made up of fatty acids or lipids, and a lack of fat intake can result in a reduced lipid layer, affecting the skin's ability to hold moisture.
To combat this, it is recommended to compensate with a moisturiser that enforces the skin's lipid barrier from the outside. A product with a high concentration of lipids can help replenish what is lacking due to dietary restrictions.
A healthy, balanced diet that provides the necessary nutrients can help support the skin in its protective functions. Dry skin can be a symptom of specific nutrient deficiencies, including vitamins A, C, and E, as well as minerals like zinc. Consuming omega-3 fatty acids, found in fatty fish like salmon, nettle seeds, chia seeds, and linseed oil, can help fill the skin's lipid reserves and stabilise its natural protective barrier.
Additionally, biotin, also known as vitamin B7 or vitamin H, is considered essential for skin health. Good sources of biotin include egg yolk, oat flakes, salmon, herring, tomatoes, spinach, dairy products, bananas, and walnuts.
Other dietary recommendations to prevent skin dryness include:
- Avoiding alcohol, caffeine, and excessive salt, as they can drain moisture from the body.
- Limiting trans fats found in fried and baked goods, as they can hinder blood circulation in the deeper layers of the skin.
- Reducing sugary food intake, as it is linked to inflammation, which can interfere with the skin's protective functions.
- Incorporating foods rich in beta-carotene, an antioxidant that helps prevent dry and ageing skin. Apricots, sea buckthorn, carrots, and bell peppers are good sources.
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Dairy and acne
Dieting can cause stress, which in turn can lead to skin breakouts. A change in diet can also cause breakouts as the skin adjusts to new foods. This is known as "dieter's acne".
There is a significant amount of evidence to support the idea that dairy can irritate or cause acne in some people. The American Academy of Dermatology estimates that acne affects 50 million people each year, and the rate of acne has risen alongside the increased consumption of dairy and processed foods in Western diets.
The link between dairy and acne is not yet fully understood, but there are several theories. One theory is that the hormones in milk, such as androgen hormones and IGF-1, can interact with our hormones and boost sebum production, leading to acne. Another theory is that the whey protein found in milk could be linked to acne. A third theory is that milk products, when combined with refined foods and sugars, disrupt insulin levels, making the skin more prone to acne.
Some studies have found that skim milk is more likely to trigger acne than whole milk, although the processing of skim milk may explain this. Other studies have found that whole milk is linked to acne. There is also evidence that suggests that yoghurt and cheese do not contribute to acne, while other studies suggest that all dairy products are associated with an increased likelihood of acne.
If you suspect that dairy is causing your acne, you could try an elimination diet, keeping a food diary, or eliminating dairy during breakouts or long-term.
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Frequently asked questions
A lean diet may cause skin breakouts, especially at the beginning of your diet. This is because the stress of changing your diet can impact your skin. However, in the long term, a lean diet may improve your skin.
Foods that cause a spike in blood sugar levels, such as high-glycemic foods (sugary drinks, sweets, white bread, and rice), are associated with acne. Insulin increases the activity of androgen hormones, which stimulates the skin's oil glands, making acne breakouts more likely. Milk and other dairy products have also been linked to acne.
A low-glycemic diet may reduce acne severity. Low-glycemic foods include fruits, vegetables, whole grains, and lean meats. A Mediterranean diet, rich in fruits, vegetables, whole grains, legumes, fish, and olive oil, has been linked to reduced acne severity.
In addition to diet, acne-friendly skincare and acne medication can help prevent breakouts. If you are experiencing dry, flaky skin, use a moisturizer that enforces the skin's lipid barrier.
