Can Snails Get Fat?

Can Snails Get Fat

Can Snails Get Fat?

We are frequently confronted with discussions about excessive fat and its implications for human health. Yet, it’s uncommon for us to consider the potential effects of excess weight on animals. Often, we gauge an animal’s health based on its size and weight. However, have we ever wondered if snails get fat from overfeeding?

Snails cannot get ‘fat’ like humans or other animals. However, overconsumption of protein-rich foods can cause their bodies to grow faster than their shells, leading to minor cracks. This issue, more common in young snails, can be easily detected and resolved by moderating their protein intake.

Like all animals, snails require energy, but overeating does not necessarily equate to increased strength. This article delves into understanding when a snail is considered ‘overweight’ and provides guidance on managing and reversing this condition.

Understanding Weight Parameters for Snails

Snail Weight Management
Image by wirestock on Freepik

Similar to humans, snails require a body weight proportionate to their size. However, in the context of snails, weight should align with the length of the shell, as described in a study exploring the weight and length relationship in Nerita lineata snails.

Also Read: Can Mystery Snails Overeat?

In the study, scientists analyzed snails averaging 8.77-10.07 inches (22.27-25.57 centimeters) in length, with weights ranging from 4.93 – 6.09 grams. Therefore, to assess the weight of your snail, begin by measuring its length. For instance, a snail of about 8.66 inches (22 centimeters) should weigh around 5 grams. If the same snail exceeds 6.5 grams in weight, it may be overconsuming food.

In a separate experiment conducted in 1933, scientists revealed a complex relationship between body weight and instances of parasitism in snails. The purpose was to examine a snail’s reaction to temperature changes. The snails studied ranged from healthy ones to those suspected of illness and parasitism.

Upon concluding the experiment, it was determined that diseased snails had a higher weight than their healthy counterparts. Healthy snails’ weight ranged from 3.000 grams at the lower end to 6.400 grams at the higher end, with an average weight of 4.881 grams. In contrast, snails afflicted with various diseases weighed 0.852 grams more on average.

Based on these results, a snail could be considered ‘fat’ if it weighs more than 7 grams. This finding also suggests that snails might be more susceptible to parasitism if they have excess body weight.

Other studies corroborate these findings. For example, a mature Giant East African Snail typically possesses between 7 and 9 whorls. While this species can have a shell length surpassing 7.9 inches (20 centimeters), they average around 4 inches (10 centimeters), with their body measuring slightly longer and an average weight of about 32 grams.

What Can Lead to Overweight Snails?

Many who tend to garden snails care for them with the same level of dedication as they would a child or pet. Part of this care involves maintaining a clean habitat and ensuring sufficient food. 

An intriguing observation comes from the realm of a snail enthusiast, whose mystery snails were seen to devour all the vegetables provided within just a few hours. Initially, it was assumed that the serving size might have been too small, leading to an increase in the amount of food offered in subsequent feedings.

Yet, no matter the portion size, the snails made quick work of the vegetables. A few weeks later, signs began to show that suggested overeating. The snails appeared swollen and were slower to emerge from their shells, indicative of carrying extra weight.

This observation underscored a crucial lesson: if food is abundant, snails will continue to eat. Their voracious appetite was not bound by portion size, leading to an overconsumption of food. Slowness in emerging from their shells showed their increased weight due to overeating.

The required food quantity for each meal depends on the snail species. For instance, a mystery snail might require one lettuce leaf and a tablespoon of fish food per meal. If the snail inhabits a fish tank, it can supplement its diet with algae and leftovers from the fish. By keeping the tank clean, the snail inadvertently consumes some food as well.

It’s recommended to start with a daily teaspoon of fish food and small pieces of calcium-rich vegetables for your snails. Observing the amount of food left after feeding can help adjust the portions accordingly.

Recognizing Hunger in Your Snail

Unlike young children who can vocalize their hunger, snails don’t cry out when they need food. Instead, they exhibit heightened risk-taking behavior, as revealed in a study by Professors George Kemenes, Kevin Staras, and Dr. Michael Crossley at the University of Sussex.

This research found that hunger can cause snails to alter their food preferences. Well-fed snails tend to avoid harmful substances, but a hungry snail might consume such substances when extremely hungry and other food options are unavailable.

In these scenarios, a snail’s central dopaminergic interneurons function like control switches, triggering potentially dangerous behaviors, such as consuming harmful food substances they would usually disregard.

In your own tank, you might notice that your snails begin to eat live plants when extremely hungry. Other signs of hunger include:

  • Unusual eating habits, like chewing on non-food items.
  • Frantic movement around the tank.

Interestingly, snails aren’t the only creatures that resort to risky behavior when hungry. Professors George Kemenes, Kevin Staras, and Dr. Michael Crossley noted that some people have been known to consume leaves, grass, or tree bark during famine. Despite these substances providing no nutritional value for humans, it is a desperate response to extreme hunger.


Snails can face challenges when overfed. Overconsumption can lead to various complications, potentially including digestive problems. Also, when snails overeat, they may reproduce excessively, creating an overpopulation in their tank.

Additionally, this could lead to excess waste, which can compromise the cleanliness of their habitat. Thus, maintaining a balanced diet is crucial for snails’ health.



  • Paul Odoteh

    Paul Odoteh is an established writer and editor with nearly 10 years of experience in writing and editing. He holds a bachelor's degree in IT and has written for numerous publications and individuals. Currently, Odoteh is dedicated to expanding his blog,, which was inspired by his passion for owning an aquarium. Odoteh Paul

Leave a Reply