Portion sizes today are much larger than in the past, leading people to consume more calories than intended. A portion is the amount on one's plate while a serving has a standardized measurement. People often pour or serve themselves more than one serving without realizing. While education is important, subtle environmental cues strongly influence eating behaviors by triggering instinct over conscious decision making. The limbic system drives unconscious, emotional eating and discounts future consequences. Small changes like using smaller plates and pre-portioning snacks can help control portions and encourage healthy eating habits.