Substance guides

How drugs and alcohol affect your weight

Published July 28, 2025 · 7 min read · Updated April 2026

Reviewed for accuracy by licensed clinical professionals.

Different substances affect weight differently, and weight changes in recovery are common and sometimes challenging.

Weight loss substances

Stimulants (meth, cocaine, Adderall) suppress appetite and increase metabolism. Opioids can suppress appetite. Extreme weight loss from stimulant use is medically dangerous and involves muscle loss, not just fat.

Weight gain substances

Alcohol adds calories (7 cal/gram) and impairs metabolism. Marijuana increases appetite (munchies). Some psychiatric medications used in treatment cause weight gain.

Weight in recovery

Stimulant recovery: appetite returns, often dramatically. Weight gain of 20-40 pounds is common and normal as the body recovers. Alcohol recovery: many people lose 10-20 pounds as alcohol calories are eliminated. Opioid recovery: appetite normalizes, weight typically returns to pre-addiction baseline over months.

Managing weight in recovery

Recovery weight changes are normal and healthy. Your body is healing. Do not restrict food in early recovery as this can trigger relapse. Focus on nutrition quality over quantity. Exercise supports both recovery and healthy weight.

Authoritative sources

This article references guidelines from: NIDA · SAMHSA · CDC

Frequently asked questions

Why did I gain weight after quitting meth?

Appetite returns to normal (or temporarily exceeds normal) after stimulant cessation. Weight gain of 20-40 pounds is common as your body rebuilds.

Will I lose weight if I stop drinking?

Many people lose 10-20 pounds in the first 2-3 months of sobriety from eliminated alcohol calories and improved metabolism.

Should I diet in early recovery?

No. Restrictive dieting in early recovery can trigger relapse. Focus on nutrition quality and let your body stabilize naturally.

Disclaimer: Informational only. Not medical advice. SAMHSA: 1-800-662-4357.