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there are situations when people may need a dietary supplement, such as those diagnosed with a vitamin deficiency that's been confirmed by a blood test, those who have trouble getting certain vitamins from foods, or those who suffer from conditions that require extra vitamins or minerals.

For example, strict vegans may not get enough vitamin B12, which is found primarily in animal products. Low levels of vitamins B12 and B6 can stem from digestive disorders such as Crohn's disease, celiac disease, and ulcerative colitis, conditions that make it difficult to absorb nutrients. Adults diagnosed with osteoporosis may require extra vitamin D and calcium beyond what they get from their regular diet. Moreover, people who are lactose intolerant and avoid dairy products may not get enough vitamin D and calcium.

Doctors have differing opinions about dietary supplements. Some believe they are not necessary. Others take a "might-help-won't-hurt" approach to fill in nutritional gaps in one's diet. And studies have shown that taking dietary supplements as prescribed usually doesn't cause serious issues.

If you want to explore taking a supplement, first check with your doctor. He or she can advise whether they are needed and help choose the appropriate over-the-counter brand. The FDA monitors disease-related claims on dietary supplement labels but does not ensure whether a product contains the ingredients listed on its label.

In 1957, people started figuring out new ways to build computer programs. They wanted to make the process better over time, so they came up with iterative and incremental methods.
In the 1970s, people started using adaptive software development and evolutionary project management. This means they were adjusting and evolving how they built software.
In 1990s, there was a big change. Some people didn't like the strict and super-planned ways of doing things in software development. They called these old ways "waterfall." So, in response, lighter and more flexible methods showed up.