I dreamt that someone gave me food to give my sister in law but I ate the food
Dreams about food often symbolize emotional or spiritual nourishment, and the fact that you were given food to give your sister-in-law but ended up eating it instead, may suggest feelings of guilt or selfishness about not fulfilling a responsibility or obligation towards her.
Alternatively, it could be interpreted as a subconscious desire to satisfy your own needs before attending to the needs of others, or a feeling of superiority or entitlement that leads you to feel justified in taking something that was intended for someone else.
It is also important to understand the context of the dream and any emotions you felt while dreaming. This can provide further insight and understanding of what your subconscious is trying to communicate to you.