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The first question is whether you are sure that your weight loss is a negative thing. Have you lost fat or muscle or both? After your weight loss can you be considered underweight, even slightly?
If you have lost muscle mass and are now underweight, then you need to examine your new diet and make a few changes. Incorporating some amount of exercise into your daily schedule will also probably help, as long as you are not suffering from any condition that would contraindicate such a measure. In any case, at the age of 59 it is advisable to consult your doctor before undertaking any exercise, especially if you have not been used to much physical exertion in the last few years.
If you are not used to physical strain, you should simply take up walking - a brisk walk for half an hour or 45 minutes a day should be enough.
Of course, along with this, you need to adjust your intake of food. It is possible to get all the necessary nutrients from a vegetarian diet, so you do not need to worry about this factor. However, you should make sure that your diet is as varied as possible. Meat and meat products provide a lot of nutrients from relatively few food sources. It takes a wider variety of plant sources of food to provide these same nutrients. Therefore, if your vegetarian diet is limited to just four or five vegetables and a couple of fruits, you are quite certain to lose weight and end up with some deficiencies.
If your vegetarian diet does not exclude eggs and dairy products, then you already have a good source of protein. Even if you consume only one of these - either eggs or milk products - you can still easily get all the protein you need. You can try marginally increasing your intake of either one (but be sure to get this cleared by your doctor) in order to get more protein. However, if both eggs and dairy products are excluded from your diet, you should be more particular. Protein is composed of eight essential amino acids, and while meat contains all eight, most plant sources of food miss out on one or the other of these acids. You should therefore make it a point to eat more of foods such as soy, buckwheat, and quinoa. Here to however, variety helps - if your diet is varied, it will combine to ensure that you get all eight essential amino acids.
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