The antonyms for the phrase "more energy giving" are "less energizing" or "energy sapping." When a food or beverage is less energizing, it may lack the necessary nutrients and compounds required to boost one's energy levels. Some examples of less energizing foods include processed snacks, sugary drinks, and unhealthy fats. On the other hand, energy-sapping foods weaken the body, causing fatigue and lethargy. These kinds of foods include high-carb meals, alcohol, and caffeine in large amounts. When seeking to maintain high energy levels, it's essential to consume foods rich in protein, vitamins, and healthy fats, which provide a sustained source of energy.