Excess of nutrients causes conditions like obesity, cancer, diabetes and heart diseases. On the other hand, insufficient nutrients cause undernutrition leading to protein, vitamin and mineral deficiencies.
Malnutrition cases are usually seen in children and women of reproductive ages. It is prevalent in developing countries due to social and economic factors.
It hampers the growth and development processes lowers immunity, increases mortality risk and causes several other health problems.
The symptoms depend on the deficiency diseases of a particular nutrient. Some common deficiencies include
- Protein-energy deficiency causes kwashiorkor and marasmus
- Iron deficiency leads to anemia
- Vitamin A deficiency affects the eye and reproductive health
- Vitamin B deficiency can result in pellagra, cognitive and skin problems, growth defects, weight loss, fatigue.
- Vitamin C deficiency causes scurvy
- Vitamin D and calcium deficiency affects bone strength
The deficiency can also be caused by poor absorption of nutrients or inability of the body to utilize the nutrients.
Intake and absorption of nutrients can also be hampered by an excess of another nutrient, medications or other factors.
Certain physical factors like poor dental health, difficulty in swallowing and loss of appetite can also lead to malnutrition.
The simplest cure is to increase the intake of deficient nutrients or balance the number of nutrients through diet and supplements.
After diagnosing the disease, one can include foods rich in a particular nutrient.
Spirulina is a very nutrient-rich food that can be used to treat malnutrition. Numerous studies report improvements in health and nutrient levels after Spirulina consumption. 
Spirulina is a unicellular blue-green microalga that grows in both fresh and salt water. It has been used by generations for its nutritional and therapeutic purposes.
Nowadays it is being cultivated for commercial use and available as a dietary supplement. Some commonly grown species include Spirulina platensis, Spirulina Maxima, and Spirulina fusiforms.
The nutritional composition of Spirulina is quite impressive. It contains proteins and amino acids (65%), carbohydrates (15%), lipids (6.5%), minerals (9%), fiber (1.5%0 and water (3%).
This composition varies slightly depending on the place and environment in which Spirulina is cultured. 
6 Science-Backed Benefits of Spirulina For Reversing Malnutrition
Following are the reasons why Spirulina is an excellent supplement to combat nutritional issues.
1. It Improves the Overall Nutritional Status
Spirulina is full of proteins, vitamins, and minerals. Therefore, it helps in enhancing the overall quality of nutrition in individuals.
A study was conducted where 16 children were given 10g Spirulina daily, in addition to the local diet. Z-score (statistical parameter to determine nutritional levels) corresponding to weight-for-age and weight-for-height showed a considerable increase.
This implies improving the nutritional status of undernourished children with Spirulina treatment. 
Another large-scale study was conducted involving 550 children with severe protein deficiencies.
Children who were given Spirulina showed better nutritional condition after the study, and it was inferred that Spirulina is an effective food supplement. 
Spirulina was also shown to increase the nutritional quality of HIV patients.  Apart from this, several studies conducted demonstrate the efficacy of Spirulina in improving the nutritional parameters in different parts of the world.   
What does this Mean? Studies prove the positive effects of Spirulina on nutrition levels.
2. It is Rich in Proteins
Protein-energy malnutrition is very common in infants.
The body breaks down the protein from the diet into amino acids and uses them to produce functional proteins for performing biochemical and metabolic functions in the body.
The Journal of the Serbian Chemical Society reports that Spirulina contains 55-70% protein, which is highest for any natural food. 
Also, the protein obtained from Spirulina is easily digested and absorbed by the body. 
Some amino acids cannot be synthesized by the body like lysine, leucine, isoleucine, methionine, phenylalanine, threonine, valine and tryptophan.
These are called essential amino acids and have to be obtained from the diet.
Spirulina provides all these 8 essential amino acids to the body. 
Spirulina contains more protein that many foods which are considered protein-rich. Its protein levels are higher than nuts, legumes, meat, and whole grains. 
The protein from meat contains animal fats and increases cholesterol. This adverse effect is not found in Spirulina.
It also has much more usable protein compared to milk, chicken, fish, beef, and soybeans.
In a study conducted on burn patients, Spirulina treatment leads to an increase in the nutritional proteins in the blood.
Burn patients are susceptible to malnutrition and health deterioration due to the risk of infection and burnt body parts.
The study was conducted on 40 burn patients for 20 days who were given different concentrations of Spirulina depending on their age.
The results indicated an increase in albumin, total proteins and other proteins. 
Another research published in the International Journal of Pediatrics on 50 undernourished children studies the effect of giving 10 g Spirulina supplement.
The results show improved nutritional status and increased levels of total proteins and albumin in children who received this supplement in addition to the local diet.
This change was not observed in the group who were not given this supplement. 
What does this Mean? Spirulina is an excellent protein source and can be used to treat protein malnutrition.
3. It Contains Different Vitamins
Spirulina contains high amounts of beta-carotene (precursor to Vitamin A). Deficiency of Vitamin A can cause eye disorders and also lead to blindness.
One gram of Spirulina meets daily Vitamin A requirement for an adult. 
Studies have also shown that β-carotene, obtained from natural sources has greater bioavailability than those which are chemically synthesized.
A study published in the Journal of Nutritional Science states that 228 children who were given 2g and 4g Spirulina for 10 weeks reported that the β-carotene levels in serum significantly increased in comparison with the children who were not given Spirulina.
The Vitamin A stored in the body was also elevated in proportion to the amount of Spirulina given. Therefore, Spirulina was considered a good source of Vitamin A. 
What does this Mean? Spirulina provides various types of vitamins to the body and can be used to combat vitamin deficiencies.
4. It is a Storehouse of Minerals
Spirulina contains various minerals like iron, magnesium, phosphorous, potassium, calcium and selenium. 
A study published in the International Journal of Current Microbiology and Applied Sciences proves that it is rich in iron, selenium, and manganese. 
Spirulina is considered a vital and natural source of iron. Iron deficiency is common in children, older people, and women of childbearing age and causes anemia.
10g of Spirulina provides 55% of the daily recommended dosage of iron. 
A study conducted on 40 elderly individuals of age 50 years or more, who were given Spirulina supplementation for 3 months reported increased hemoglobin values and improved immunity in the individuals. 
Spirulina is also abundant in calcium and phosphorus. The levels of these minerals in Spirulina are similar to that in milk and beneficial for bone health.
High availability of calcium from Spirulina ensures its easy absorption. 
What does this Mean? The high amounts of minerals in Spirulina make it an important source and supplement to prevent and deal with mineral scarcity and disorders in the body.
5. It Comprises of Essential Fatty Acids
Fat is required by the body to maintain healthy skin, eyes, and brain. The presence of fats enables efficient vitamin absorption by the body.
Fat deficiency may hamper these processes.
About 18% of Spirulina consists of essential fatty acids, which are required by the body.
Spirulina is known to increases serum HDL-cholesterol (the good cholesterol) levels. Animal studies show increased levels of high-density lipoproteins with Spirulina supplementation.
It is also considered a good source of gamma-linolenic acid (GLA), which performs essential functions in the body.
What does this Mean? Spirulina provides the body with essential lipids.
6. It has Several other Benefits that can help in Reversing Malnutrition
Some other significant advantages of using Spirulina for malnutrition are:
It is suitable for vegetarians and vegans and can provide enough protein which they cannot obtain from meat.
It also has more protein content than soybeans and peanuts which are the most common vegetarian protein sources. 
Spirulina is easily digested by the body and absorbed efficiently in both raw and dried forms, as it is devoid of cellulose wall, which is harder to digest.
Thus, it can be used to treat malnutrition arising from poor digestion and absorption.
It is perfectly safe to use and has no adverse effects on the body. Allergies from Spirulina are exceedingly rare.
Spirulina can be grown locally in developing or underdeveloped countries where malnutrition is quite common. It grows easily and provides a high yield.
What does this Mean? Spirulina offers many health benefits, is very favorable for cultivation and very safe for use.
- Spirulina is dried and made available as tablets, flakes or powders for easy consumption.
- Normal dosage for adults is 4-6 tablets of 500mg each or 1-2 teaspoons Spirulina powder.
- Spirulina can be taken with honey, smoothies, shakes, and soups to improve the taste.
- It can be incorporated into bakery products for children without compromising the taste.
- However, when using for malnutrition, the proper dosage has to be calculated based on the deficiency or medical condition by consulting with a medical professional or nutritionist.
- Always opt for genuine, branded and pure products.
- If you plan to use Spirulina to treat malnutrition in children or pregnant and breastfeeding women, it is important to seek medical advice to determine the dosage and safety of use. 
- Individuals on prior medications should consult with their physician before taking Spirulina for possible drug interactions.
- As Spirulina contains phenylalanine, it is not considered suitable for use by Phenylketonurias who are unable to metabolize this amino acid.
- Spirulina boosts the immune system and can worsen the condition of people with autoimmune disorders.
- Although Spirulina is considered safe for use, people with seafood allergies should be extra conscious.
- Some Spirulina products could be toxic if they contain Spirulina that was grown in contaminated waters.
Spirulina is a storehouse of several nutrients and therefore, an excellent nutritional supplement.
It is very efficient in combating malnutrition while preventing and treating various deficiency diseases.
It is rich in proteins, vitamins, minerals, carbohydrates, and essential lipids. It provides the body with healthy nourishment. It can be added to the diet and taken as a food supplement.