You have a solid skincare routine—gentle cleanser, lightweight moisturizer, maybe a salicylic acid toner or a clay mask a few times a week. So why is your skin still looking shiny by noon, and why are those breakouts hanging around? The problem might not be in your bathroom cabinet. It might be in your refrigerator.
What you drink can directly affect how much oil your skin produces and how well your skincare products can actually do their job. Here are three common beverages that could be undermining your oily skin routine.
1. Sugary sodas and sweetened coffee drinks
The link between sugar and acne is well documented. When you drink a soda or a sugary latte, your blood sugar spikes quickly. That spike triggers a surge in insulin and a related hormone called insulin-like growth factor 1 (IGF-1). Those hormones tell your sebaceous glands to pump out more sebum—the oily substance that can clog pores and feed acne-causing bacteria.
One study in the Journal of the Academy of Nutrition and Dietetics found that high-glycemic diets raised acne risk significantly compared to lower-glycemic eating patterns. You might think a “healthy” iced coffee with flavored syrup is fine, but the sugar load can be just as high as a can of soda.
What to try instead
If you need a caffeine fix, stick to black coffee or a simple unsweetened latte. Herbal iced tea or sparkling water with a squeeze of lemon can replace soda without the sugar rush.
2. Cow’s milk
Dairy, especially skim milk, has a surprising reputation in dermatology. Multiple studies show that regular milk consumption correlates with acne severity. The dairy-related hormones and bioactive molecules in cow’s milk can stimulate oil production and inflammation in the skin.
In a study published in Dermatology Practical & Conceptual, researchers found that people who drank milk daily were more likely to have acne than those who rarely drank it. The effect appears strongest with skim milk, possibly because processing changes the balance of hormones in the milk.
Cow’s milk is designed to help a calf grow quickly—not to be a regular part of a human adult’s diet, especially if your skin is already prone to oiliness and breakouts.
What to try instead
Unsweetened almond milk, oat milk, or coconut milk are good swaps for cereal or smoothies. If you still want to use dairy, full-fat versions may have a smaller effect than skim—but cutting back is the most reliable move.
3. Alcohol (especially beer and sugary cocktails)
Alcohol affects your skin in a few ways that are bad news for an oily skin routine. First, it dehydrates your body—and when your skin is dehydrated, it can overcompensate by producing more oil to try to protect itself. That extra oil can lead to clogged pores and breakouts.
Second, alcohol promotes inflammation throughout the body, and inflamed skin is more reactive and more prone to acne. A 2019 review in the Journal of Clinical and Aesthetic Dermatology noted that alcohol consumption is associated with increased sebum production and lower skin barrier function over time.
Sugary cocktails are a double hit: you get the alcohol-induced dehydration and inflammation plus the blood-sugar spike from the mixers. Craft beer is also relatively high in carbohydrates that can act similarly to sugary drinks in the body.
What to try instead
If you do drink, stick to spirits with a sugar-free mixer like soda water and lime, or a dry red wine. Most importantly, drink a glass of water between every alcoholic beverage to minimize dehydration.
Making a few changes to what’s in your glass can give your skincare routine the support it needs. No cleanser or toner can fully counteract the effects of a diet high in sugar, dairy, or alcohol. Hydrate smartly, and your products—and your complexion—will work better.
