70 pounds in 5 months is a lot. Over that span of time you could lose an average of 2 to 3 pounds a week safely if you do it the right way.
Here are a few tips:
1. You MUST exercise if you want to lose weight and keep it off, so do something every day, even if it's just a 15-minute walk around the neighborhood. Don't say you don't have time for exercise; you have to MAKE time. Yes, it takes time and effort, but you're worth it, right?
2. Walk as much as you want, but don't do cardio for more than 40 minutes at a time. If you do, you risk burning muscle instead of fat. Walking is the preferred exercise for weight (READ: FAT) loss because it burns fat almost exclusively and it burns almost as many calories per hour as jogging. You can also breathe much easier while walking, and walking doesn't pound the heck out of your ankles, knees, and hips like jogging does.
3. If you do strength training, use light weights and do lots of repetitions. That'll really help you "tone up." If you're at all concerned about your midsection, you'll need to do abdominal exercises that hit all the major muscle groups (upper abs, lower abs, obliques, transverse abdominis, and back muscles) every other day. WARNING: Ab exercises burn very few calories, so don't rely on them to burn fat. What they will do is give your gut that "sucked in" look 24/7 if you do them regularly. Google each muscle group with the word "exercises" and you'll find websites that'll show you exercises to work that muscle group.
4. Your diet will make you or break you. You have probably learned bad eating habits over time (most people do). That's not your fault, but now you have to deal with it. Make a commitment to yourself to unlearn those bad habits and re-learn better habits.
5. Eat breakfast every day within an hour of getting up. It kick-starts your metabolism. Studies have shown that people who skip breakfast are 450% more likely to be overweight than those who eat breakfast every day.
6. Eat six small meals or snacks per day instead of three squares per day or one big meal per day. If you eat too much at one sitting, your body stores the extra calories as fat. Go too long between meals and your metabolism slows down. Your body expends energy digesting your food, so eating smaller portions more often keeps your metabolism running high because you're constantly digesting food.
7. Avoid these as much as possible:
-- Trans fat (any type of partially or fully hydrogenated oil)
-- High fructose corn syrup (soft drinks are LOADED with it)
-- Fast food
-- Junk food
-- White sugar, white flour, white rice, white potatoes
-- The deadly C's (cookies, cakes, candy, chips, cola)
8. Build your diet around these trim-body-friendly foods:
-- Nuts, any kind (almonds are best)
-- Fresh vegetables (green is GREAT!!!)
-- Dairy products (as long as they're low-fat or non-fat)
-- Lean meats (fish and poultry top the list)
-- Olive oil
-- Whole grain breads/cereals/pasta
-- Fresh fruits (anything that ends in "berry" is a winner)
-- Tea (green tea or black pekoe tea)
-- Cold water or ice water (your body has to expend extra calories to heat it up)
9. Desserts and treats are the exception, not the rule. Having said that, however, (1) you can have a couple of pieces of chocolate every day - just don't overdo, and (2) Allow yourself one "cheat meal" every week where you eat and drink whatever you want as long as you don't gorge yourself. That'll help keep you from feeling deprived and it'll make it easier to stick with your new healthy eating plan.
"The three great essentials to achieve anything worthwhile are first, hard work; second, stick-to-itiveness; third, common sense."
-- Thomas Alva Edison, inventor extraordinaire