Alcohol and Nutrition: How Drinking Affects What Your Body Actually Gets

Most people know alcohol has calories. Fewer people realize that alcohol affects nutrition in ways that go far beyond the calorie count on a beer label.

Alcohol changes how your body absorbs nutrients. It depletes specific vitamins and minerals. It affects blood sugar. It alters appetite and eating patterns. These effects compound over time in ways that can significantly impact how you feel—and that you might be noticing during Dry January.

Here’s what alcohol does to your nutrition, and what happens when you give your body a break.

Alcohol’s caloric impact

Let’s start with the obvious: alcohol contains calories. Seven calories per gram—almost as calorie-dense as fat (9 calories per gram) and nearly double carbohydrates or protein (4 calories per gram).

What this means in practice:

• A glass of wine: 120-150 calories
• A beer: 100-200 calories depending on type
• A cocktail: 150-500+ calories (mixers add up fast)
• A night of moderate drinking (3-4 drinks): 400-800 calories

These are “empty” calories—they provide energy but zero nutritional value. No protein, no vitamins, no minerals, no fiber.

But here’s what makes it worse: your body prioritizes metabolizing alcohol over everything else. When you drink, fat burning essentially stops until the alcohol is processed. Any food you eat alongside alcohol is more likely to be stored as fat rather than used for energy.

This double effect—empty calories plus disrupted metabolism—helps explain why cutting out alcohol often leads to weight changes even without other dietary modifications.

How alcohol impairs nutrient absorption

Beyond calories, alcohol directly interferes with how your body absorbs and uses nutrients:

B vitamins

Alcohol significantly depletes B vitamins, particularly B1 (thiamine), B6, B12, and folate.

How it happens:

• Alcohol damages the stomach lining, reducing absorption
• It increases urinary excretion of B vitamins
• It interferes with the liver’s ability to store and activate B vitamins
• Heavy drinking can cause severe deficiencies

What you might notice:

• Fatigue (B vitamins are crucial for energy production)
• Brain fog and difficulty concentrating
• Mood disturbances
• Weakness

During Dry January, as your gut heals and B vitamin levels restore, energy and mental clarity often improve.

Vitamin D

Alcohol impairs vitamin D absorption and the liver’s ability to convert it to its active form.

What this affects:

• Bone health
• Immune function
• Mood regulation
• Muscle function

Zinc

Alcohol increases zinc excretion through urine and impairs absorption.

What this affects:

• Immune function
• Wound healing
• Taste and smell (which can affect appetite)
• Skin health

Magnesium

Similar to zinc, alcohol causes magnesium depletion through increased urinary loss.

What this affects:

• Sleep quality
• Muscle function
• Stress response
• Blood sugar regulation

The cumulative effect of these depletions can leave you feeling tired, foggy, anxious, and generally unwell—symptoms that often improve during Dry January as nutrient levels normalize.

Alcohol and blood sugar

Alcohol has complex effects on blood sugar:

Short-term: Alcohol can cause blood sugar to drop, especially if you drink without eating. This is why you might feel shaky or hungry after drinking.

Medium-term: Alcohol interferes with how your liver regulates blood sugar, potentially causing fluctuations and cravings.

Eating patterns: Alcohol often leads to eating more (lowered inhibitions, late-night snacking) and making less healthy food choices.

During Dry January, many people notice their blood sugar feels more stable. Fewer cravings, more even energy throughout the day, less need for snacking.

Gut health and alcohol

Your gut plays a larger role in overall health than you might realize—and alcohol affects it significantly:

Stomach lining: Alcohol irritates the stomach lining, which can cause inflammation, discomfort, and reduced nutrient absorption.

Gut microbiome: Alcohol disrupts the balance of bacteria in your gut. This matters because gut bacteria affect everything from digestion to immune function to mental health.

Intestinal permeability: Heavy drinking can damage the intestinal barrier, allowing substances that should stay in the gut to leak into the bloodstream (sometimes called “leaky gut”).

Digestive enzymes: Alcohol can interfere with production of digestive enzymes, leading to incomplete digestion.

As your gut heals during Dry January, you might notice:

• Less bloating and discomfort
• More regular digestion
• Reduced acid reflux
• Generally feeling better after eating

Why you might feel better (or different) with food

Without alcohol, your relationship with food often shifts:

Appetite changes: Some people feel hungrier without alcohol (especially initially). Others find their appetite normalizes. Without alcohol stimulating appetite and lowering food inhibitions, eating patterns often become more intentional.

Taste changes: With improved zinc levels and reduced inflammation, food may actually taste better. Many people report enjoying food more during Dry January.

Fewer cravings: More stable blood sugar and better nutrient absorption can reduce cravings for sugar and carbs that often accompany drinking.

Better food choices: Without the “might as well” effect of drinking (where you make less healthy choices because you’re already drinking), many people naturally gravitate toward better nutrition.

Nutritional support during Dry January

If you want to support your body’s recovery during Dry January:

Focus on B vitamins

Good sources:

• Whole grains
• Eggs
• Meat and poultry
• Leafy greens
• Legumes
• Nutritional yeast

Consider a B-complex supplement if you were a heavy drinker—deficiencies can be significant.

Support your gut

• Eat fiber (vegetables, fruits, whole grains)
• Consider fermented foods (yogurt, kimchi, sauerkraut)
• Stay hydrated
• Avoid foods that irritate your gut (different for everyone, but often includes highly processed foods)

Maintain stable blood sugar

• Eat regular meals
• Include protein and fat with carbohydrates
• Limit added sugars
• Don’t skip meals (blood sugar crashes can trigger cravings)

Stay hydrated

Alcohol is dehydrating. Even without it, many people don’t drink enough water. Hydration supports every bodily function and can help with energy and mental clarity.

Don’t restrict too much

Some people try to “maximize” Dry January by also dieting aggressively. This can backfire—restriction can increase cravings and make the month harder. Focus on eating well, not eating less.

The sugar replacement pattern

One common pattern worth mentioning: many people doing Dry January find themselves craving sugar more than usual.

This happens because:

• Alcohol is metabolized similarly to sugar—your body may be seeking the same hit
• Blood sugar may be unstable during adjustment
• You may be unconsciously seeking a reward/pleasure source

This is normal and usually temporary. The best approach:

• Don’t stress too much about it
• Try to satisfy cravings with fruit or other whole foods when possible
• Know that cravings typically decrease as your body adjusts

What changes last?

Some nutritional benefits of not drinking develop quickly; others take time:

Within days to weeks:

• Better hydration
• Improved blood sugar stability
• Reduced bloating
• Better sleep (which affects metabolism)

Within weeks to months:

• Restored vitamin and mineral levels
• Healed gut lining
• Normalized appetite and eating patterns
• Potential weight changes

Long-term benefits (if you continue reduced drinking):

• Sustained nutrient absorption
• Stable weight management
• Reduced inflammation
• Better gut microbiome diversity

What you maintain after January depends on what drinking pattern you return to.

Common question

Will I lose weight during Dry January?

Many people do—the University of Sussex study found 58% lost weight. However, it’s not guaranteed. Some people compensate with more food or sugary drinks. Weight loss depends on overall calories in versus out, and alcohol removal is just one factor.

Why am I craving sugar during Dry January?

Your body may be seeking the sugar-like hit that alcohol provided. Blood sugar may also be adjusting. This is common and usually temporary. Try satisfying cravings with fruit, and know they typically decrease over time.

Should I take supplements during Dry January?

If you were a moderate drinker, eating a balanced diet should be sufficient. If you were a heavy drinker, a B-complex vitamin and possibly a multivitamin might help restore depleted levels. Consult with a healthcare provider if you’re concerned about specific deficiencies.

Why does food taste different?

Alcohol affects taste perception directly and also depletes zinc, which impacts taste. As your body recovers, food may taste more vibrant. Many people enjoy eating more during Dry January.

How long does it take for nutrient levels to normalize?

For most moderate drinkers, nutrient levels improve within weeks. For heavy drinkers, some deficiencies can take months to fully correct. Eating well accelerates the process.