The following could be signs of alcohol abuse:
- Lie about drinking habits: Dishonesty about the amount or frequency of drinking is a common sign of alcohol abuse.
- Drinks alone: Frequently consuming alcohol in isolation can be indicative of problematic drinking behavior.
While "lose interest in food" can sometimes be associated with alcohol abuse (as excessive drinking may lead to neglecting nutrition), it is not as direct a sign as the other two. "Overly pleasant mood" could also occur for various reasons and may not necessarily indicate alcohol abuse.
So, the most clear signs from your list would be "Lie about drinking habits" and "Drinks alone."