As for if you’re dealing with health issues, you really have to defer to your doctor. For instance, if you have kidney disease, you also want to talk to your doctor about appropriate protein intake. If you have heart disease, you can still go low carb, but you may be better off opting for monounsaturated fats (avocados, nuts, and olive oil) over saturated fats (butter and red meat). Everyone’s cholesterol levels respond differently on a low-carb diet, so if yours are going up, switch to unsaturated sources of fats, Spritzler recommends. “In general, this is a diet most people can do. If you have a chronic condition, work with a doctor who understands low-carbohydrate diets to monitor you,” she adds.
If you want to cut costs even more you can replace the avocado in the tuna salad (if you are not lucky enough to find avocados on sale) with more vegetables. A drizzle of some extra olive oil on the salad will compensate for the reduction of fat from the avocado. You can also substitute any of cheeses in the recipes for other types of cheese that you may find on sale.
"One of the primary places where you are going to see metabolic changes on any kind of diet is in your gastrointestinal tract -- and that can include a change in bowel habits often experienced as constipation," says Sondike, who is also credited with conducting the first published, randomized clinical trial on low-carb diets. The reason, Sondike tells WebMD, is that most folks get whatever fiber they consume from high-carb foods such as bread and pasta. Cut those foods out, and your fiber intake can drop dramatically, while the risk of constipation rises.
At the start, do not deny yourself fat. Eat enough so that you are satisfied and you do not feel hungry. That way you will soon become what is called “fat adapted” — burning fat for fuel efficiently. You will know that you are fat adapted when you do not need to eat every few hours and you no longer feel the highs and lows (“hangry” episodes) that can accompany a high carb diet.
Exercise reduces appetite. It is good for general cardiovascular fitness and strength, but is a hard way to lose weight. If you find it hard to exercise, simply moving more has significant health benefits and can increase your metabolic rate. Get up and move around every half hour, walk don’t take the bus, stairs instead of lift…Get a pedometer and try to increase your steps by 10% each week.
If you have type 1, it's important to know that the best way to keep your blood sugar levels steady is to carb count rather than following a particular diet. And there is no strong evidence that following a low-carb diet is safe or beneficial, which is why we don’t recommend this diet for people with type 1 diabetes. But some people with type 1 have reported needing less insulin and losing weight from following a low-carb diet. 
Low-carb diets may help prevent or improve serious health conditions, such as metabolic syndrome, diabetes, high blood pressure and cardiovascular disease. In fact, almost any diet that helps you shed excess weight can reduce or even reverse risk factors for cardiovascular disease and diabetes. Most weight-loss diets — not just low-carb diets — may improve blood cholesterol or blood sugar levels, at least temporarily.
It’s really important to first reduce your carb intake from unhealthy sources such as sugary drinks, pizzas, cakes, biscuits, chips, white bread, fruit juices and smoothies. And it is a good idea to get your limited carbs from healthy high-fibre carb foods, such as pulses, nuts, vegetables, whole fruits and whole grains, as well as unsweetened milk and yoghurt.  
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