Tag: Biology

Toxicology and its effects

Toxicology deals with the science of poisons. Chemicals/substances which are toxic in nature are present in the environment and find their way to the organisms through food chain, contact or respiration. The lower doses of these chemicals get accumulated in the body tissues and impair the growth/function while their higher doses are lethal. The human environment gets affected through these chemicals when they become part of the food chain. Soil-water-plant-animal activities are resulting in environmental degradation in form of deforestation, erosion, silting up of reservoirs, wastelands, air, soil and water pollution and desertification. Changing land uses, faulty irrigation systems, excessive use of chemicals in agriculture are causing the problems of soil and water pollution, toxic residues in food items and resource degradation. This in turn affects land productivity and human health.

Technological development and economic growth have brought about a rapid increase in the production of a variety of chemicals including pesticides for use in agriculture, industry and public health. This has brought countless benefits to our society in a way to improve our living standards, food production and sanitation. These man-made chemicals while on one hand are beneficial, also cause hazards to men and environment. With increasing stress on industrial and agricultural expansion programmes, in both developed and developing countries, the environmental risks of these chemicals on animal and plant life are also increasing at threatening rate as more than 1000 new molecules are introduced into the environment every year. The emergence of these chemicals and their environmental consequences have lead to the evolution of new branch of science, generally known as environmental toxicology which include the hazardous effects that these toxins have on humans, other animals and plants.

The toxicological studies on these chemicals in different laboratories of the world have established the hazardous potential of carcinogenicity, mutagenicity and teratogencity of some of the commonly used chemicals in agriculture and industry. A few of them have also been found to cause injury to immune system causing immuno-toxicological problems leading to depleting competence of the living organisms to mount resistance to viral, bacterial and fungal infections, In fact, immunotoxicological processes may be a basis of well documented toxic and allergic hypersensitivities as well as a myriad of disease entities of unknown etiology including autoimmune disorders and malignancy.

The Challenge

Lester Brown of World Watch Institute in 1997 cautioned that all the basic indicators of food security, grain production per person, carry over stock of grain, area of croplands signal a tightening situation during 1990’s Growth in food production is slowing with the grown in demand, driven by population growth and the rising affluence continues to be strong. The population growth is a big challenge. Stabilizing climate means reducing carbon emissions and hence fossil fuel burning. Improving energy efficiency is equally important. Securing future food supplies will affect every facet of human existence from land use policy to water use policy. Environmental concerns will have over riding priority if a healthy human life is the goal. He further states that environmental disruption could disrupt the economic progress.

Human Life Style and Environment

Modern life style with sufficient food, comfort, luxury, leisure and changed cultural habits also introduces in the environment thousands of chemicals, machinery and equipment’s. The polluted surroundings are the bonus. In addition to disastrous effect on environment, the environmental pollutants may have direct effect on human health which may be again acute in the long term. The long term effect cannot be known immediately, it is expressed only after long time of the exposure and this is of great human concern. Long term health effect lead to induction of genetic damage and/or cancer caused by environmental pollutants associated with some of our modern life style. Here mutagenic and carcinogenic efficiencies of indoor pollutants like cigarette smoke (both main stream and side stream), smoke released during burning of mosquito repellents and radiations emitted from our housing materials and consumer goods are noteworthy.

Today, cancer has become the biggest “killer” after heart disease. It is well established that alteration in gene(s) of a normal cell i.e. mutation, is responsible for initiation of cancer thus cancer is genetical in origin and starts from somatic mutation. This is ample evidence that mutations in human somatic calls are indicators of cancer.

Drink More Water

Water is a vital part of our everyday lives and is used by our body in many different ways. It is so important that humans can’t survive for more than a week without fresh water. However, a lot of us underestimate the importance of drinking water daily and do not truly appreciate what water does for our bodies. Depending on factors such as location, fat index, age and sex, the average human is between 55-60% water. In fact, the brain alone is made up of 73% water, the lungs are 83%, and even bones contain some amount of water. Despite all this, many people take it for granted, not drinking even close to the adequate amount of water needed for bodily functions to take place properly. So, an understanding of how water helps us may encourage people to drink water more frequently.

Some of its Benefits

  • You need water to stay hydrated and maintain an adequate amount of fluid in your body. Water helps in the production of sweat, which keeps body temperatures cool as you exercise. When you perspire, the excess heat from your body is lost to the atmosphere through evaporation, regulating your body at an optimal temperature. Water also prevents your muscles from getting tired as fast and allows you to have a quicker recovery post-workout.
  • Drinking more water can actually help in weight loss. When your stomach senses that it is full, it sends signals to the brain to make you feel full. This reduces your hunger and makes you less likely to overeat.
  • There is a strong correlation between your mental energy levels and how hydrated you are. Water is needed in every cell in your body and your brain cells are no exception. Water helps transport oxygen and nutrients to the brain for optimal mental function.
  • One of the most common causes of headaches is dehydration. When you are dehydrated, the brain contracts temporarily due to fluid loss. Hence, drinking water helps in preventing headaches and other minor health problems.
  • Constipation occurs when the stools in your colon don’t get enough water. When you are dehydrated, water is diverted from the large intestine to hydrate the rest of your body. So, ample amount of water needs to be consumed to ensure healthy bowel movements.
  • Kidney stones are hard deposits of salt and minerals that form within the kidney or urinary tract. You need enough fluids in your system to dilute the concentration of minerals that can turn into these stones. Hence, water prevents the formation of kidney stones.
  • When your skin is dehydrated, it will become dry, tight and flaky. Staying hydrated can reduce the appearance of ageing, making you look younger and fresher.

How much water should you drink?

The body constantly loses water throughout the day, mostly through urine and sweat but also from regular body functions like breathing. To prevent dehydration, you need to get plenty of water from drink and food every day. The recommended daily water intake for adults is 8 – 10 glasses of 250ml each glass. However, there is no universally agreed quantity of water that must be consumed daily, and the amount may vary depending on the person. Many internal and external factors determine how much water a person should drink per day. So, we must identify in our own lives whether we think we are getting enough water or not. In case you are feeling excessive thirst, dry mouth, dry skin, headaches, sleepiness, dizziness, etc., it is an indication that you are not drinking enough water.

It is also important to highlight that though drinking ample amount of water everyday is important, one should not overdo it. Drinking too much water can lead to water intoxication, which is when the levels of salt and other electrolytes in your body become too diluted. While it is rare, this can be a medical emergency if the electrolytes in your body fall too low and too fast.

At the end of the day, we should drink an adequate amount of water as per our requirements. This will allow us to reap the benefits of water, and prevent symptoms of not drinking water.