Sattu blend, derived from sand-roasted black chickpeas (chana), is a traditional and nutrient-dense flour widely consumed in India, particularly in the states of Bihar, Jharkhand, and Uttar Pradesh. It's a versatile, unrefined, and indigenous food product known for its cooling properties and high nutritional value. 

Sattu is typically made from black chickpeas that have been roasted and then ground into a fine powder. It is often considered a "poor man's protein" due to its affordability and richness in essential nutrients.

The term reflects its historical context and accessibility. It was a practical and economical way to get a nutrient-dense meal, especially for those working long hours in the fields who needed a simple, filling food that provided sustained energy and could be prepared without any cooking, just by mixing with water. 

However, calling Sattu a "poor man's food" is a misnomer in the modern context, and here's why it is, in fact, a superfood for everyone: 

1. High Protein Content: As a potent source of plant-based protein, sattu is crucial for muscle repair, growth, and overall bodily functions, making it particularly beneficial for vegetarians and vegans.
2. Excellent Source of Dietary Fiber: The high fiber content in sattu aids in promoting regular bowel movements, preventing constipation, and supporting a healthy digestive system. It also helps in managing cholesterol levels.
3. Low Glycemic Index: Sattu has a low glycemic index, which means it releases sugar slowly into the bloodstream. This makes it an ideal food for managing blood sugar levels and is beneficial for people with diabetes. 
4. Promotes Gut Health: The fiber in sattu acts as a prebiotic, nourishing beneficial gut bacteria and contributing to a healthy gut microbiome.
5. Aids in Weight Management: The combination of protein and fiber in sattu helps to keep you feeling full for longer, reducing overeating and supporting healthy weight management.
6. Energy Booster: Sattu provides a sustained release of energy due to its complex carbohydrates, making it a great natural energizer for athletes and those with active lifestyles.
7. Rich in Essential Minerals: Sattu is packed with essential minerals like iron, manganese, and magnesium, which are vital for oxygen transport in the blood, bone health, and various metabolic processes.
8. Natural Body Coolant: It is traditionally known for its cooling properties, making it a popular summer drink that helps to maintain the body's temperature and prevent heat-related ailments.

Uses of Sattu Powder:
Sattu powder's versatility allows it to be incorporated into a wide range of culinary applications. It's most famous for: 

Sattu Sharbat: A traditional drink that can be made by mixing sattu with water, black salt, and lemon juice.
Sattu Paratha: A popular North Indian flatbread with a spicy sattu filling.
Litti Chokha: The filling of litti, a traditional Bihari dish, is made primarily from sattu.
Desserts and Porridges: Sattu can also be used to make sweet dishes, porridges, and energy bars, offering a nutritious base.

In addition it can be consumed just by mixing it in water as a replacement to protein powders.