Portion size

Portion size

BioCertica Content Team

Written by: Jonine Möller, M.Sc. in Sport Science

Do our genes determine our preferred meal portion size? In this blog post, we will explore the connection between genetics and preferred meal portion size and how it can impact weight gain.

Our genes play a significant role in regulating hunger and fullness signals, which are crucial in maintaining energy balance and a stable weight. Variations in certain genes have been linked to higher levels of hunger, a greater likelihood of overeating, and decreased sensitivity to fullness signals. As a result, people with these genetic variations may tend to eat larger portions and be more susceptible to weight gain.

However, genetics is not the only factor that determines preferred meal portion size. Environmental and cultural influences, such as portion sizes commonly served in restaurants, can also play a significant role in shaping our perception of what is considered a "normal" portion size. Additionally, personal experiences and habits, such as regularly eating large portions, can cause our bodies to adjust to the increased calorie intake and crave larger portions.

Moreover, psychological factors, such as stress, anxiety, and depression, can also influence our meal portion size. When we are feeling stressed or anxious, we may overeat and prefer larger portions, leading to weight gain. On the other hand, depression can lead to decreased appetite and a preference for smaller portions.

Finally, food availability also plays a role in determining meal portion size. In areas with limited food options, people may eat smaller portions due to scarcity. On the other hand, in areas with abundant food choices, people may consume larger portions due to the availability of various food options.

With all of the above being said, the sizes of our meals are not necessarily inherently good or bad. As we mentioned, genes have been shown to influence whether people are naturally inclined to eat smaller or larger meals. There is no need to go against your DNA. Weight is not dependent on the size of your meals but on what you eat and the total amount you eat.

There is no evidence that eating several small meals is better than less frequent large meals. On the contrary, significant evidence shows numerous benefits of intermittent fasting and eating less regularly.

Thus, if someone is inclined to eat smaller meals, they may need to eat small healthy snacks in between meals or eat more often.  They may find it particularly hard to do intermittent fasting.

People inclined to eat larger meals don’t have to force themselves to eat smaller ones. They should, however, refrain from snacking or eating too regularly. These individuals may find it easier to do intermittent fasting.

In conclusion, preferred meal portion size is a complex interplay of various genetic, environmental, and personal factors. While genetics does play a role in regulating hunger and fullness signals, it is only one of many factors that contribute to determining meal portion size. It is important to be mindful of our portion sizes, listen to our bodies' hunger and fullness signals, and maintain a healthy balance to prevent weight gain. By understanding the connection between genetics and preferred meal portion size, we can make informed choices about our diets and promote healthy eating habits.


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