Wow, I just love hearing stories like this. I realize it's just the beginning of her journey, but making that first step is a huge one. Good for her!
I wish I could convince my older sister to go vegan. I have one sister that is, and one that isn't. The one that isn't has suffered from hypertension, obesity, cancer, thyroid issues, arthritis, fibromyalgia, Type 2 diabetes and more. I have tried, but she is in denial about her diet. She's addicted to her foods.
Our mother died from a massive heart attack at age 59, which is way too young if you ask me. Sadly our mother had severe food addictions too. My mom also suffered from chronic depression, which she tried to sooth with food. It's not uncommon, which is why weight-loss is not always as simple as changing what you eat. Anyhow, feeding her depression with her food addiction was a vicious cycle that sadly ended with her tragic death at much to young an age.
Your sister has a big challenge, but it sounds like she's ready for it. Morbid obesity is often more than just diet alone. She could possibly require counseling for food addiction. The problem is finding counselors that are pro-vegan. At least for now she's very lucky to have such a supportive little sister. It sounds like you inspire her too.
This is such a complex issue, and I am far from qualified to give advice. I do know that what she's doing is definitely achievable.
For weight loss, she would be better following a whole foods plant-based diet, with no salt, oil and sugar. I'm going to post some YouTube channels and other related info below of people like her or with similar stories as your sister that can possibly help and inspire. There's the famous Chef AJ. Her success story is amazing, but so are many others.
While I know water fasting can be very helpful, it can also create problems, especially if you take medications. I personally would not recommend it without a plant-based doctor's advice and supervision.
Ginger helps with nausea, naturally. Maybe some soda water or something might help too. There's definitely a detoxifying period, but I can't be sure what's causing her nausea. A lot of new vegans don't eat enough. I get nauseated on an empty stomach, myself.
What I suggest is to just keep inspired, and learn about cooking plant-based foods that you actually enjoy. Never lose sight of your goal. Keep watching videos and documentaries related to plant-based living and veganism. Watch them over, if you have to. Just keep inspired. Never give up! If you feel tempted, watch Forks Over Knives again. Do what you have to to stay inspired and focused on living healthy. Like Nike, just do it!
The beauty of being vegan/plant-based is it's a complete livable lifestyle for the rest of your life. This is not some fad diet that will fail after a year or two. It has everything you need...with maybe the exception of B12. Many vegans supplement with B12. The best thing you can really do is never stop educating yourself about plant-based living. That's my 2 cents.
I wish you the best of luck, both of you, and please keep us posted.
A very useful site - https
/nutritionfacts.org/
Jeanne Schumacher -
https://www.youtube.com/channel/UCsudrjn6IxMFxIsgyA_HzSQ
Chef AJ-
https://www.youtube.com/user/therealchefaj
Plant Based Melissa -
https://www.youtube.com/channel/UCNY3wBmhodboNLDHf8Wjo_Q
Denny's Plant Based Journey -
https://www.youtube.com/channel/UC_U4GPaCE59IDIqAOsvQMgQ
Spilling The Beans -
https://www.youtube.com/channel/UCrCZMVUq1ie6ndYcUsHm2uA
Jane Esselstyn -
https://www.youtube.com/channel/UCkVtuE3WR0NhNnDiP5d_pAA
Eating You Alive -
https://www.youtube.com/channel/UCjT_puAbUNfU_LUONgr0xkw
Cooking With Plants -
https://www.youtube.com/channel/UCh2CcI5FT661MGIrZCxNeTw
Forks Over Knives -
https://www.youtube.com/channel/UCuwi1gSKyqz28BVCc9qeuIA
There are so many more amazing inspirational YouTube channels.
Here's a few very inspiring documentaries I also recommend:
Forks Over Knives -
https://www.forksoverknives.com/the-film/
Eating You Alive -
https://www.eatingyoualive.com/
What The Health -
http://www.whatthehealthfilm.com/