Overview

Did you know that marasmus, a severe form of malnutrition, can cause a child to lose body weight, resembling a "skin and bones" appearance?¹ This extreme condition not only stunts physical growth but can also irreversibly impair cognitive development if not treated promptly. In this article, we will explore the impact of marasmus on growth and development and the long-term consequences on affected individuals.

What is marasmus?

Marasmus is a severe form of malnutrition characterized by energy deficiency. It primarily affects infants and young children and causes weight loss and muscle wasting.² Unlike other forms of malnutrition, marasmus does not cause edema (swelling due to fluid retention) but leads to a dramatic decrease in fat and muscle mass, making the body appear extremely thin and emaciated.¹  

Marasmus is a global health concern, with millions of children affected worldwide.World Health Organization (WHO) statesmalnutrition contributes to nearly half of all deaths in children under five, with marasmus being a significant cause.³ The condition is most common in developing countries, where food insecurity and poverty are prevalent.

Three factors causing marasmus are:^1,4

1. Nutritional Deficiency: The most direct cause of marasmus is an inadequate intake of calories and protein. This deficiency can result from insufficient food availability or poor dietary practices, leading to severe energy depletion and muscle wasting.
2. Socioeconomic Factors: Poverty, food scarcity, and lack of access to health care and education contribute to malnutrition. Additionally, maternal malnutrition and poor breastfeeding practices exacerbate the risk of marasmus in infants.
3. Infections and Diseases: Frequent infections and chronic illnesses can increase the risk of marasmus. Conditions like diarrhoea, respiratory infections, and parasitic diseases can impair nutrient absorption and increase metabolic demands, further depleting the body's energy reserves.

Symptoms of marasmus

Physical symptoms

1. Severe Weight Loss: This is the most apparent physical symptom of marasmus is severe weight loss.^4,5 Children suffering from marasmus exhibit an alarming reduction in body weight, often falling below 60% of the expected weight for their age.¹ Skin becomes loose and wrinkled due to the lack of subcutaneous fat, and the bones become prominently visible.
2. Muscle Wasting: As the body depletes fat stores, it breaks down muscle tissue to obtain energy. This leads to significant muscle loss, causing extreme weakness and a frail physique.⁴ The limbs appear thin and fragile.The child may struggle with basic movements and activities due to a lack of muscle strength and mass.
3. Fat Loss: Marasmus also results in substantial fat loss. The body’s fat reserves are entirely depleted, leading to a lack of energy storage.The loss of fat further exacerbates the child's vulnerability to infections and other health complications.⁴

Behavioural symptoms

1. Irritability: Children with marasmus often exhibit increased irritability and fussiness. The lack of essential nutrients and energy affects their mood and temperament, making them more prone to crying and agitation.
2. Lack of Energy: A significant behavioral symptom of marasmus is a profound lack of energy. Affected children are   lazy and display minimal interest in their surroundings and activities.
3. Developmental Delays: Developmental delays are common among children with marasmus. The severe nutrient deficiency hampers physical growth and brain development, leading to delays in reaching developmental milestones such as crawling, walking, and talking. Cognitive impairments, learning difficulties, and delayed social skills are also associated with marasmus.⁴

Impact on physical growth

Stunted growth 

Marasmus severely impacts a child's physical growth, often resulting in stunted growth. Children suffering from marasmus display significantly lower height and weight metrics compared to their healthy peers. Without adequate nutrients, the body's growth processes slow down, leading to a noticeable lag in reaching growth milestones. 

Long-term physical weakness

The severe nutrient deficiency associated with marasmus also affects muscle and bone development. Muscle wasting is a prominent feature, as the body breaks down muscle tissue to meet its energy needs. This muscle degradation results in long-term physical weakness, making even simple physical activities challenging for affected children.

 Additionally, the lack of essential vitamins and minerals, such as calcium and vitamin D, impedes proper bone development. This leads to fragile bones, increased susceptibility to fractures, and conditions like osteoporosis later in life.⁶ 

Immune system impairment - increased susceptibility to infections

Marasmus also weakens the immune system, making children more susceptible to infections. Malnutrition impairs the production and function of immune cells, reducing the body's ability to fight off pathogens. As a result, children with marasmus frequently suffer from recurrent infections, which exacerbate nutritional deficiencies and further hinder  growth. They suffer from respiratory illnesses, gastrointestinal disturbances, and skin conditions.

Impact on cognitive development

Brain development 

• Structural Changes: Marasmus profoundly affects brain development, leading to structural changes that can have long-lasting implications. During critical periods of growth, the brain requires a steady supply of nutrients to develop properly. In the absence of these nutrients, as seen in marasmus, the brain's growth and maturation are stunted. This results in reduced brain size and alterations in brain structure, which can affect various cognitive functions.⁷
• Neurotransmitter Function: The severe malnutrition associated with marasmus also disrupts neurotransmitter function. Neurotransmitters arechemicals that transmit signals between neurons, facilitating communication within the brain. A lack of key nutrients, such as amino acids and vitamins, can impair the synthesis and function of neurotransmitters, leading to deficits in cognitive processes.⁸ This disruption can affect everything from mood regulation to executive functions, resulting in difficulties with attention, problem-solving, and emotional control.

Cognitive abilities

• Learning Difficulties: Children with marasmus often experience significant learning difficulties. Nutrient deficits impair brain function, leading to challenges in acquiring new knowledge and skills. These children struggle with basic academic tasks, such as reading, writing, and arithmetic. The cognitive delays are not just limited to the classroom; they also impact the ability to process information, think critically, and make decisions. 
• Memory Impairment: Marasmus also leads to memory impairment. The structural and functional changes in the brain hinder the ability to store and retrieve information. Affected children havedifficulty in remembering instructions, retaining new information, or recalling previously learned material. This memory impairment further compounds their learning difficulties, making it hard for them to keep up with their peers and progress academically.

Emotional and social development

• Behavioural Issues: The impact of marasmus extends beyond cognitive functions to emotional and behavioural development. Children suffering from marasmus are more prone to behavioural issues, such as irritability, anxiety, and aggression. These problems are often a result of both the direct impact of malnutrition on brain function and the stress associated with chronic illness and deprivation. Behavioural issues can disrupt family dynamics and make it challenging for children to form positive relationships.
• Social Interaction Challenges: Social interaction challenges are also common in children with marasmus. The combination of cognitive delays, emotional difficulties, and physical weakness makes it hard for these children to engage with their peers. They may struggle with communication, understanding social cues, and in group activities. 

Summary

Marasmus is a severe form of malnutrition caused by inadequate caloric intake, and has a devastating impact on children's growth and development. Physical growth is stunted, with significant weight loss, muscle wasting, and fat loss. The immune system is compromised, leading to increased susceptibility to infections. Cognitive development is also severely affected, with structural changes in the brain, impaired neurotransmitter function, and difficulties in learning and memory.

The long-term consequences of marasmus are far-reaching, including chronic health issues like cardiovascular problems and diabetes, as well as economic impacts such as reduced productivity and increased healthcare costs. Moreover, marasmus can create a cycle of malnutrition that affects future generations.

 Preventing marasmus requires a multi-faceted approach, including nutritional programs like supplementation and food security initiatives, education and awareness campaigns, improved healthcare access, and vaccination programs. Early intervention is crucial to mitigate the long-term effects of marasmus and ensure the healthy development of children.