Answer: In answering the question, there are a few things that need to be considered. The first is that lead is a naturally occurring element, and it is ubiquitous in nature, meaning that it is found everywhere. Therefore, all fishponds already have lead in them to some degree. So the first consideration is to remember that your question becomes a question of presence versus significance. Next, not all lead is equally toxic. The oxidation state and the anion associated with lead in a particular compound will heavily dictate the significance of the presence, even in environments where the content is very high. A good example of this is when the lead is present as the mineral galena (PbS). Although galena is some 87% lead, and may be present in large quantities in the bed of the fish pond, PbS is not particularly bioavailable, and therefore, its presence, even at high concentrations is not biologically significant. In the other end of the biological scale are the organic leads, such as tetraethyl lead and tetramethyl lead. These leaded compounds are particularly bioavailable and can be of considerable concern in the aquatic environment. Finally, the last consideration is the food chain. Different kinds of leaded compounds will bioaccumulate to different degrees. And, depending on the food, chain, may therefore enter higher omnivores and carnivores in the surrounding environment, and may (but not necessarily) effect the health of those animals as well. So the answer to your questions lies with properly defining the word "contaminant" and recognizing that the mere presence of lead does not equal contaminant, even at very high concentrations - rather of greater importance is the significance of the lead, based on its bioavailability in the context of the existing environment.
Answer: Because most sodas contain about 60-75mg of caffeine, as compared to 150mg in a cup of coffee, the diuretic effects are rather small and considered not significant by most professionals unless consumed in larger quantities (5 times a day or more). The diuretic effect is much less pronounced that that seen when medicinal diuretics like Lasix are taken.
Answer: People prefer to drink mineral water rather than tap water as mineral water has had all the bad microbes taken out by a filter. Tap water however, has had the bad microbes taken out with small amounts of chlorine The chlorine is not good for you to drink. Now though, at home you can by a tap filter to get mineral water out of your tap.
Answer: That, of course, depends on which bottles water and which tap water. In general, tap water is held to higher regulatory standards than bottled water so the answer is usually no. Most bottled water is not fortified with fluoride so drinking it rate than tap water can be detrimental to your teeth. Also, some plastics leach chemicals that can be bad for your health.
Answer: This answer is culture dependent. In the US, women are discouraged from drinking alcohol at all while pregnant, but in France, it is encouraged that the pregnant woman drink one (1) glass of red wine a day.
Answer: There is nothing inherently dangerous about the citric acid found in ordinary citrus drinks. However, as everyone is different, if you feel that there is a concern in your particular case, such as an allergy, than please contact your ob/gyn.
Answer: Urinate regularly because it is an essential part of the detoxification process.You start with two glasses as soon as you get out of bed to help with bowel movements.You drink a glass before and after each meal.