Too much work, not enough time--a problem we're all too familiar with. Rushing from one meeting to the next, studying for our next presentation, and managing client concerns: we constantly make excuses for why we can't stop and take the time to eat.

Sure, with such hectic schedules, it can be difficult to maintain a healthy, balanced diet. But how can we be so focused on taking care of our clients that we forget to take care of ourselves? Choosing not to eat during the day can take a heavy toll on our overall health. Here are four reasons why you should not skip lunch:

#1: It will negatively impact your mood and productivity.

Taking time each day to nourish our bodies and refuel is important, both mentally and physically. Especially if you're always on the go, you'll definitely benefit from the extra energy. Studies show that eating lunch will impact productivity later in the day and your attitude toward work in general. Optimal productivity is achieved working in 90-minute intervals, taking a a break after each interval, according to Tony Schwartz, author of The Way We're Working Isn't Working.

#2: It can cause frustration, irritability, and less patience.

It goes without saying that these emotional symptoms will not work in your favor. Working 60 or more hour work weeks is tiring enough, so you will need to keep your energy levels up in order to stay at the top of your game. According to a study published in Journal of Nutrition, when physicians skipped lunch, they felt emotionally drained later in the day. The researchers' observations of the physicians' lunchtime patterns confirmed what many employees experience in other industries.

#3: It can increase your stress levels.

Ever heard someone say they're "hangry" (hungry and angry)? Turns out, this concept isn't too far-fetched. Eating throughout the day helps keep your blood sugar at normal levels. Skipping a meal will lead to an increase in cortisol, a hormone that elevates stress.

#4: Studies show skipping meals leads to weight gain.

Many people who skip meals throughout the day end up eating larger meals later and consuming more calories, according to the National Institutes of Health. Also, in another study, published in the journal Metabolism, researchers found that when healthy people skipped meals throughout the day but consumed more food when they sat down for a meal, they were at risk for significant metabolic changes--which can ultimately lead to weight gain. Which, as it turns out, can be a long-term problem (and distraction) to an entrepreneur--most of whom would prefer building their company rather than working to shed those extra pounds.

Are you guilty of skipping lunch? Can you relate to anything on this list?